ST9040

16K ROM HCMOS MCU

WITH EEPROM, RAM AND A/D CONVERTER

Register oriented 8/16 bit CORE with

RUN, WFI and HALT modes
Minimum instruction cycle time : 500ns
(12MHz internal)
Internal Memory :
ROM 16K bytes
RAM 256 bytes
EEPROM 512 bytes
224 general purpose registers available as RAM,
accumulators or index registers (register file) PQFP80

80-pin PQFP package for ST9040Q

68-lead PLCC package for ST9040C
DMA controller, Interrupt handler and Serial Pe-
ripheral Interface as standard features
Up to 56 fully programmable I/O pins
Up to 8 external plus 1 non-maskableinterrupts
PLCC68
16 bit Timer with 8 bit Prescaler, able to be used
as a WatchdogTimer
Two 16 bit Multifunction Timers, each with an 8
bit prescaler and 13 operating modes (Ordering Information at the end of the Datasheet)
8 channel 8 bit Analog to Digital Converter, with
Analog Watchdogs and external references
Serial Communications Interface with asynchro-
nous and synchronous capability
Rich Instruction Set and 14 Addressingmodes
Division-by-Zero trap generation
Versatile developmenttools, including assembler,
linker, C-compiler, archiver, graphic oriented de-
buggerand hardware emulators
Real Time Operating System
Windowed and One Time Programmable EPROM
parts available for prototyping and pre-production
developmentphases
Pin to pin compatible with ST9036

February 1997 1/56

 TABLE OF CONTENTS

ST9040 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.1 I/O Port Alternate Functions . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.2 EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.2.2 EEPROM Programming Procedure . . . . . . . . . . . . . . . . . . 11
1.3.2.3 Parallel Programming Procedure . . . . . . . . . . . . . . . . . . . 11
1.3.2.4 EEPROM Programming Voltage . . . . . . . . . . . . . . . . . . . 11
1.3.2.5 EEPROM Programming Time . . . . . . . . . . . . . . . . . . . . . 11
1.3.2.6 EEPROM Interrupt Management . . . . . . . . . . . . . . . . . . . 11
1.3.2.7 EEPROM Control Register . . . . . . . . . . . . . . . . . . . . . . 12
1.3.3 REGISTER MAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2 ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

ST90E40 / ST90T40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
1.1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
1.2 PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
1.2.1 I/O PORT ALTERNATE FUNCTIONS . . . . . . . . . . . . . . . . . . . . 39
1.1 MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
1.2 EPROM PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
1.2.1 Eprom Erasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
ST90R40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
1.1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
1.2 PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
1.2.1 I/O PORT ALTERNATE FUNCTIONS . . . . . . . . . . . . . . . . . . . . 52
1.3 MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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 ST9040

Figure 1. 80 Pin PQFP Package

Table 1. ST9040Q Pin Description

Pin Name Pin Name Pin Name Pin Name
1 AVSS 25 P34/T1INA 64 P20/NMI 80 AVDD
2 NC 26 P33/T0OUTB 63 NC 79 NC
3 NC 27 P32/T0INB 62 VSS 78 P47/AIN7
4 P44/AIN4 28 P31/T0OUTA 61 P70/SIN 77 P46/AIN6
5 P57 29 P30/P/D/T0INA 60 P71/SOUT 76 P45/AIN5
6 P56 30 A15 P72/INT4/TXCLK 75 P43/AIN3
59
7 P55 31 A14 /CLKOUT 74 P42/AIN2
8 P54 32 NC P73/INT5 73 P41/AIN1
58
9 INT7 33 A13 /RXCLK/ADTRG 72 P40/AIN0
10 INT0 34 A12 57 P74/P/D/INT6 71 P27/RRDY5
11 P53 35 A11 56 P75/WAIT P26/INT3
70
12 NC 36 A10 P76/WDOUT /RDSTB5/P/D
55
13 P52 37 A9 /BUSREQ 69 P25/WRRDY5
14 P51 38 A8 P77/WDIN P24/INT1
54 68
15 P50 39 P00/A0/D0 /BUSACK /WRSTB5
16 OSCOUT 40 P01/A1/D1 53 R/W 67 P23/SDO
17 VSS 52 NC 66 P22/INT2/SCK
18 VSS 51 DS 65 P21/SDI/P/D
19 NC 50 AS
20 OSCIN 49 NC
21 RESET 48 VDD
22 P37/T1OUTB 47 VDD
23 P36/T1INB 46 P07/A7/D7
24 P35/T1OUTA 45 P06/A6/D6
44 P05/A5/D5
43 P04/A4/D4
42 P03/A3/D3
41 P02/A2/D2

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ST9040

Figure 2. 68 Pin PLCC Package

Table 2. ST9040C Pin Description

Pin Name Pin Name Pin Name Pin Name
61 P44/AIN4 10 P35/T1OUTA 43 P70/SIN 60 AVSS
62 P57 11 P34/T1INA 42 P71/SOUT 59 AVDD
63 P56 12 P33/T0OUTB P72/CLKOUT 58 P47/AIN7
41
64 P55 13 P32/T0INB /TXCLK/INT4 57 P46/AIN6
65 P54 14 P31/T0OUTA P73/ADTRG 56 P45/AIN5
40
66 INT7 15 P30/P/D/T0INA /RXCLK/INT5 55 P43/AIN3
67 INT0 16 P17/A15 39 P74/P/D/INT6 54 P42/AIN2
68 P53 17 P16/A14 38 P75/WAIT 53 P41/AIN1
1 P52 18 P15/A13 P76/WDOUT 52 P40/AIN0
37
2 P51 19 P14/A12 /BUSREQ 51 P27/RRDY5
3 P50 20 P13/A11 P77/WDIN P26/INT3
36 50
4 OSCOUT 21 P12/A10 /BUSACK /RDSTB5/P/D
5 VSS 22 P11/A9 35 R/W 49 P25/WRRDY5
6 OSCIN 23 P10/A8 34 DS P24/INT1
48
7 RESET 24 P00/A0/D0 33 AS /WRSTB5
8 P37/T1OUTB 25 P01/A1/D1 32 VDD 47 P23/SDO
9 P36/T1INB 26 P02/A2/D2 31 P07/A7/D7 46 P22/INT2/SCK
30 P06/A6/D6 45 P21/SDI/P/D
29 P05/A5/D5 44 P20/NMI
28 P04/A4/D4
27 P03/A3/D3

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 ST9040

1.1GENERAL DESCRIPTION
The ST9040 is a ROM member of the ST9 family of software control to provide timing, status signals,
microcontrollers, completely developed and pro- an address/databus for interfacing external mem-
duced by SGS-THOMSON Microelectronics using ory, timer inputs and outputs, analog inputs, exter-
a proprietary n-well HCMOS process. nal interrupts and serial or parallel I/O with or
The ST9040 peripheral and functional actions are without handshake.
fully compatible throughout the ST903x/4x family. Three basic memory spaces are available to support
This datasheet will thus provide only information this wide range of configurations: Program Memory
specific to this ROM device. (internaland external), Data Memory (internaland ex-
ternal)andtheRegisterFile, which includesthecontrol
THE READER IS ASKED TO REFER TO THE andstatus registers of theon-chip peripherals.
DATASHEET OF THE ST9036 ROM-BASED DE-
VICE FOR FURTHER DETAILS. Two 16 bit MultiFunction Timers, each with an 8 bit
Prescaler and 13 operating modes allow simple
The nucleus of the ST9040 is the advanced Core use for complex waveform generation and meas-
which includes the Central Processing Unit (CPU), urement, PWM functions and many other system
the Register File, a 16 bit Timer/Watchdog with 8 timing functionsby the usage of the two associated
bit Prescaler, a Serial Peripheral Interface support- DMA channels for each timer. In addition there is
ing S-bus, I2C-bus and IM-bus Interface,plus two 8 an 8 channel Analog to Digital Converter with inte-
bit I/O ports. The Core has independent memory gral sample and hold, fast 11s conversion time
and register buses allowing a high degree of pipe- and 8 bit resolution. An Analog Watchdog feature
lining to add to the efficiency of the code execution is included for two input channels.
speed of the extensive instruction set. The power-
ful I/O capabilities demanded by microcontroller Completing the device is a full duplex Serial Com-
applications are fulfilled by the ST9040 with up to munications Interface with an integral 110 to
56 I/O lines dedicated to digital Input/Output. 375,000 baud rate generator, asynchronous and
These lines are grouped into up to seven 8 bit I/O 1.5Mbyte/s synchronous capability (fully program-
Ports and can be configured on a bit basis under mable format) and associated address/wake-up
option, plus two DMA channels.

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ST9040

1.2 PIN DESCRIPTION

AS. Address Strobe (output, active low, 3-state). 7 respectively. INT0 channel may also be used for
Address Strobe is pulsed low once at the begin- the timer watchdog interrupt.
ning of each memory cycle. The rising edge of AS OSCIN, OSCOUT. Oscillator (input and output).
indicates that address, Read/Write (R/W), and These pins connect a parallel-resonant crystal
Data Memory signals are valid for program or data (24MHz maximum), or an external source to the
memory transfers. Under program control, AS can on-chip clock oscillator and buffer. OSCIN is the in-
be placed in a high-impedance state along with put of the oscillator inverter and internal clock gen-
Port 0 and Port 1, Data Strobe (DS) and R/W. erator; OSCOUT is the output of the oscillator
DS. Data Strobe (output, active low, 3-state). Data inverter.
Strobe provides the timing for data movement to or AVDD. AnalogVDD ofthe Analogto Digital Converter.
from Port 0 for each memory transfer. During a
write cycle, data out is valid at the leading edge of AVSS. Analog VSS of the Analog to Digital Con-
DS. During a read cycle, Data In must be valid prior verter. Must be tied to VSS.
to the trailing edge of DS. When the ST9040 ac- VDD. Main Power Supply Voltage (5V 10%)
cesses on-chip memory, DS is held high during the VSS. Digital Circuit Ground.
whole memory cycle. It can be placed in a high im-
pedancestate alongwith Port 0, Port 1, AS and R/W. P0.0-P0.7, P1.0-P1.7, P2.0-P2.7 P3.0-P3.7, P4.0-
P4.7, P5.0-P5.7, P7.0-P7.7 I/O Port Lines (In-
R/W. Read/Write (output, 3-state). Read/Write put/Output, TTL or CMOS compatible). 56 lines
determines the direction of data transfer for exter- grouped into I/O ports of 8 bits, bit programmable
nal memory transactions. R/W is low when writing under program control as general purpose I/O or
to external program or data memory, and high for as alternate functions.
all other transactions. It can be placed in a high im-
pedancestate along with Port 0, Port 1, AS and DS. 1.2.1 I/O Port Alternate Functions
RESET. Reset (input, active low). The ST9 is initial- Each pin of the I/O ports of the ST9040 may as-
isedby the Reset signal. With the deactivationof RE- sume software programmable Alternative Func-
SET, program execution begins from the Program tions as shown in the Pin Configuration Drawings.
memory location pointed to by the vector contained Table 1-3 shows the Functions allocated to each
in program memory locations 00h and 01h. I/O Port pins and a summary of packagesfor which
they are available.
INT0, INT7. External interrupts (input, active on ris-
ing or falling edge). External interrupt inputs 0 and
Figure 3. ST9040 Block Diagram

IN T0 INT7
8

16-Bit TIMER / WATCHDOG + SPI

16k Bytes 512 Bytes 256 Bytes 256 Bytes SCI I/O PORT 7
( SCI )
ROM EEPROM RAM REGISTER FILE
CPU WITH DMA

MEMORY BUS

REGISTER BUS

I/O PORT 0 I/O PORT 1 I/O PORT 2 I/O PORT 3 2 x 16-bi t TIMER I/O PORT 4 A / D I/O PORT 5
( Address/Data ) ( Address ) ( SPI ) ( TIMERS ) W ITH DMA ( Analog Inputs ) CONVERTER WITH HANDSHAKE

8 8 8 8 8 8
AVD D AVS S

VR001385

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 ST9040

PIN DESCRIPTION (Continued)

Table 3. ST9040 I/O Port Alternate Function Summary
I/O PORT Name Function Alternate Function Pin Assignment
Port. bit PLCC PQFP
P0.0 A0/D0 I/O Address/Data bit 0 mux 24 39
P0.1 A1/D1 I/O Address/Data bit 1 mux 25 40
P0.2 A2/D2 I/O Address/Data bit 2 mux 26 41
P0.3 A3/D3 I/O Address/Data bit 3 mux 27 42
P0.4 A4/D4 I/O Address/Data bit 4 mux 28 43
P0.5 A5/D5 I/O Address/Data bit 5 mux 29 44
P0.6 A6/D6 I/O Address/Data bit 6 mux 30 45
P0.7 A7/D7 I/O Address/Data bit 7 mux 31 46
P1.0 A8 O Address bit 8 23 38
P1.1 A9 O Address bit 9 22 37
P1.2 A10 O Address bit 10 21 36
P1.3 A11 O Address bit 11 20 35
P1.4 A12 O Address bit 12 19 34
P1.5 A13 O Address bit 13 18 33
P1.6 A14 O Address bit 14 17 31
P1.7 A15 O Address bit 15 16 30
P2.0 NMI I Non-Maskable Interrupt 44 64
P2.0 ROMless I ROMless Select (Mask option) 44 64
P2.1 P/D O Program/Data Space Select 45 65
P2.1 SDI I SPI Serial Data Out 45 65
P2.2 INT2 I External Interrupt 2 46 66
P2.2 SCK O SPI Serial Clock 46 66
P2.3 SDO O SPI Serial Data In 47 67
P2.4 INT1 I External Interrupt 1 48 68
P2.4 WRSTB5 I Handshake Write Strobe P5 48 68
P2.5 WRRDY5 O Handshake Write Ready P5 49 69
P2.6 INT3 I External Interrupt 3 50 70
P2.6 RDSTB5 I Handshake Read Strobe P5 50 70
P2.6 P/D O Program/Data Space Select 50 70
P2.7 RDRDY5 O Handshake Read Ready P5 51 71
P3.0 T0INA I MF Timer 0 Input A 15 29
P3.0 P/D O Program/Data Space Select 15 29
P3.1 T0OUTA O MF Timer 0 Output A 14 28
P3.2 T0INB I MF Timer 0 Input B 13 27
P3.3 T0OUTB O MF Timer 0 Output B 12 26
P3.4 T1INA I MF Timer 1 Input A 11 25

7/56

ST9040

PIN DESCRIPTION (Continued)

Table 4. ST9040 I/O Port Alternate Function Summary(Continued)

I/O PORT Name Function Alternate Function Pin Assignment
Port. bit PLCC PQFP
P3.5 T1OUTA O MF Timer 1 Output A 10 24
P3.6 T1INB I MF Timer 1 Input B 9 23
P3.7 T1OUTB O MF Timer 1 Output B 8 22
P4.0 AIN0 I A/D Analog Input 0 52 72
P4.1 AIN1 I A/D Analog Input 1 53 73
P4.2 AIN2 I A/D Analog Input 2 54 74
P4.3 AIN3 I A/D Analog Input 3 55 75
P4.4 AIN4 I A/D Analog Input 4 61 4
P4.5 AIN5 I A/D Analog Input 5 56 76
P4.6 AIN6 I A/D Analog Input 6 57 77
P4.7 AIN7 I A/D Analog Input 7 58 78
P5.0 I/O I/O Handshake Port 5 3 15
P5.1 I/O I/O Handshake Port 5 2 14
P5.2 I/O I/O Handshake Port 5 1 13
P5.3 I/O I/O Handshake Port 5 68 11
P5.4 I/O I/O Handshake Port 5 65 8
P5.5 I/O I/O Handshake Port 5 64 7
P5.6 I/O I/O Handshake Port 5 63 6
P5.7 I/O I/O Handshake Port 5 62 5
P7.0 SIN I SCI Serial Input 43 61
P7.1 SOUT O SCI Serial Output 42 60
P7.1 ROMless I ROMless Select (Mask option) 42 60
P7.2 INT4 I External Interrupt 4 41 59
P7.2 TXCLK I SCI Transmit Clock Input 41 59
P7.2 CLKOUT O SCI Byte Sync Clock Output 41 59
P7.3 INT5 I External Interrupt 5 40 58
P7.3 RXCLK I SCI Receive Clock Input 40 58
P7.3 ADTRG I A/D Conversion Trigger 40 58
P7.4 INT6 I External Interrupt 6 39 57
P7.4 P/D O Program/Data Space Select 39 57
P7.5 WAIT I External Wait Input 38 56
P7.6 WDOUT O T/WD Output 37 55
P7.6 BUSREQ I External Bus Request 37 55
P7.7 WDIN I T/WD Input 36 54
P7.7 BUSACK O External Bus Acknowledge 36 54

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 ST9040

ADDRESS SPACES
Table 1-4. Group F Peripheral Organization
Applicable for ST9040
DEC 00 02 03 08 09 10 24 63
DEC HEX 00 02 03 08 09 0A 18 3F

R255 RFF RESERVED RESERVED RFF

RESERVED
R254 RFE PORT 7 RFE
MSPI
PORT 3
R253 RFD RFD
RESERVED

R252 RFC WCR RFC

R251 RFB RESERVED RFB

R250 RFA T/WD RESERVED RFA

PORT 2 MFT 1 MFT 0 A/D

R249 RF9 RF9

R248 RF8 MFT RF8

R247 RF7 RESERVED SCI RF7

R246 RF6 PORT 5 MFT 1 RF6

EXT INT PORT1

R245 RF5 RF5

R244 RF4 RF4

R243 RF3 RESERVED RESERVED RF3

R242 RF2 MFT0 RF2

PORT 0 PORT 4
R241 RF1 EEPROMCR RF1

R240 RF0 RESERVED RF0

9/56

ST9040

1.3 MEMORY
1.3.1 INTRODUCTION EEPROM will cause the start of an ERASE/WRITE
The memory of the ST9 is divided into two spaces: cycle at the addressed location. Word (16 bit)
writes are not allowed.
- Data memory with up to 64K (65536) bytes The programming cycle is self-timed, with a typical
- Program memory with up to 64K (65536) bytes programming time of 6ms. The voltage necessary
Thus, there is a total of 128K bytes of addressable for programming the EEPROM is internally gener-
memory space. ated with a +18V charge pump circuit.
The 16K bytes of on-chip ROM memory of the Up to 16 bytes of data may be programmed into
ST9040 are selected at memory addresses 0 the EEPROM during the same write cycle by using
through 3FFFh (hexadecimal) in the PROGRAM the PARALLEL WRITE function.
space. A standbymode is also available which disables all
The DATA space includes the 512 bytes of on-chip power consumption sources within the EEPROM
EEPROM at addresses 0 through 1FFh and the for low power requirements. When STBY is high,
256 bytes of on-chip RAM memory at addresses any attempt to access the EEPROM memory will
200h through 2FFh. produce unpredictable results. After the re-ena-
1.3.2 EEPROM bling of the EEPROM, a delay of 6 INTCLK cycles
must be allowed before the selection of the
1.3.2.1 Introduction EEPROM.
The EEPROMmemory provides user-programma-
ble non-volatile memory on-chip, allowing fast and The EEPROM of the ST9040 has been imple-
reliable storage of user data. As there is also no mented in a high reliability technology developed
off-chip access required, as for an external serial by SGS-THOMSON, this, together with the double
EEPROM, high security levels can be achieved. bit structure,allow 300k Erase/Write cycles and 10
year data retention to be achieved on a microcon-
The EEPROM memory is read as normal RAM troller.
memory at Data Space addresses 0 to 1FFh, how-
ever one WAIT cycle is automatically added for a Control of the EEPROM is performed through one
Read cycle, while a byte write cycle to the registermapped at register addressR241 in Page0.

Figure 1-4. Memory Map

10/56

 ST9040

EEPROM (Continued)

1.3.2.2 EEPROM Programming Procedure The constraint is that each of the bytes occur in the
The programming of a byte of EEPROMmemory is same ROW of the EEPROM memory (A4 constant,
equivalent to writing a byte into a RAM location af- A3-A0 variable). To operate this mode, the Parallel
ter verifying that EEBUSY bit is low. Instructions Mode enable bit, PLLEN, must be set. The data
operating on word data (16 bits) will not access the written is then latched into buffers (at the ad-
EEPROM. dresses specified, which may be non-sequential)
The EEPROM ENABLE bit EEWEN must first be and then transferred to the EEPROM memory by
set before writing to the EEPROM. When this bit is the setting of the PLLST bit of the control register.
low, attempts to write data to the EEPROM have Both PLLST and PLLEN are internally reset at the
no affect, this prevents any spurious memory ac- end of the programming cycle. Any attempt to read
cesses from affecting the data in the EEPROM. the EEPROM memory when PLLEN is set will give
invalid data. In the event that the data in the buffer
Termination of the write operation can be detected latches is not required to be written into the memory
by polling on the EEBUSY status bit, or by inter- by the setting of PLLST, the correct way to terminate
rupt, taking the interrupt vector from the External the operation is to reset PLLEN and to perform a
Interrupt 4 channel. The selection of the interrupt is dummy read of theEEPROMmemory. This termina-
made by EEPROM Interrupt enable bit EEIEN. It tion will clear all data present in the latches.
should be noted that the Mask bit of External Inter-
rupt 4 should be set, and the Interrupt Pending bit 1.3.2.4 EEPROM Programming Voltage
reset, before the setting of EEIEN to prevent un- No external Vpp voltage is required, an internal
wanted interrupts. A delay (eg a nop instruction) 18Volt charge-pump gives the required energy by
should also be included between the operationson a dedicated oscillator pumping at a typical fre-
the mask and pending bits of External Interrupt 4. quency of 5MHz, regardless of the external clock.
If polling on EEBUSY is used, a delay of 6 INTCLK 1.3.2.5 EEPROM Programming Time
clock cycles is necessary after the end of program- No timing routine is required to control the pro-
ming, this can be a nop instruction or, normally, gramming time as dedicated circuitry takes care of
therequired time to test the EEBUSY bit and to the EEPROM programming time (The typical pro-
branch to the next instruction will be sufficient. gramming time is 6ms).
While EEBUSY is active, any attempt to access the 1.3.2.6 EEPROM Interrupt Management
EEPROM matrix will be aborted and the data read At the end of each write procedure the EEPROM
will be invalid. EEBUSY is a read only bit and can- sends an interrupt request (if EEIEN bit is set). The
not be reset by the user if active. EEPROM shares its interrupt channel with the ex-
An erased bit of the EEPROM memory will read as ternal interrupt source INT4, from which the priority
a logic 0, while a programmed cell will be read as level is derived.
a logic 1. For applications requiring the highest Care must be taken when EEIEN is reset. The as-
level of reliability, the Verify Mode, set by EEPROM sociated external interrupt channel must be dis-
control register bit VRFY, allows the reading of the abled (by reseting bit 4 of EIMR, R244) along with
EEPROM memory cells with a reduced gate volt- reseting the interrupt pending bit (bit 4 of EIPR,
age (typically 20%). If the EEPROM memory cell R243) to prevent unwanted interrupts. A delay in-
has been correctly programmed, a logic 1 will be struction (at least 1 nop instruction) must be in-
read with the reduced voltage,otherwise a logic 0 serted between these two operations
will be read. WARNING. The content of the EEPROM of the
1.3.2.3 Parallel Programming Procedure ST9040 family after the out-going test at SGS-
Parallel programming is a feature of the EEPROM THOMSONs manufacturing location is not guar-
macrocell. One up to sixteen bytes of a same row enteed.
can be programmed at once.

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ST9040

EEPROM (Continued)

1.3.2.7 EEPROM Control Register Note. After EESTBY is reset, the user must wait 6
EECR R241 (F1h) Page 0 Read/Write CPUCLK cycles (e.g. 1 nop instruction) before se-
(except EEBUSY: read only) lecting the EEPROM.
EEPROM Control Register bit 4 = EEIEN: EEPROM Interrupt Enable. INTEN
Reset value : 0000 0000b (00h) = 1 disables the external interrupt source INT4,
and enables the EEPROM to send its interrupt re-
7 0 quest to the central interrupt unit at the end of each
write procedure.
0 VERIFY EESTBY EEIEN PLLST PLLEN EEBUSY EEWEN
bit 3 = PLLST: Parallel Write Start. Setting PLLST
bit 7 = B7: This bit is forced to 0 after reset and to 1 starts the parallel writing procedure.It can be
MUST not be modified by the user. set only if PLLEN is alreadyset. PLLST is internally
bit 6 = VERIFY: Set Verify mode. Verify (active reset at the end of the programming sequence.
high) is used to activate the verify mode. bit 2 = PLLEN: Parallel write Enable. Setting
The verify mode provides a guarentee of good re- PLLEN to 1 enables the parallel writing mode
tention of the programmed bit. When active, the which allows the user to write up to 16 bytes at the
reading voltage on the cell gate is decreased from same time. PLLEN is internally reset at the end of
1.2V to 0.0V, decreasing the current from the pro- the programming sequence.
grammed cell by 20%. If the cell is well pro- bit 1 = EEBUSY: BUSY. When this read only bit is
grammed (to 1), a 1 will still be read, otherwise high, an EEPROM write operation is in progress
a 0 will be read. and any attempt to access the EEPROM is
Note . The verify mode must not be used during an aborted.
erasing or a programming cycle). bit 0 = EEWEN: EEPROM Write Enable. Setting
bit 5 = EESTBY: EEPROM Stand-By. EESTBY = this bit allows programming of the EEPROM, when
1 switches off all power consumption sources in- low a writing attempt has no effect.
side the EEPROM. Any attempt to access the 1.3.3 REGISTER MAP
EEPROM when EESTBY = 1 will produce unpre- Please refer to the Register Map of the ST9036 for
dictable results. all general registers with the exceptionof the regis-
ter shown in the following table.
Table 1-5. Register Map Addendum

EECR R241 (F1h) Page 0 Read/Write Control Registers

Figure 1-5. EEPROM Parallel Programming Rows

12/56

 ST9040

2 ELECTRICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

VDD Supply Voltage 0.3 to 7.0 V

AVDD, AVSS Analog Supply Voltage VSS = AVSS < AVDD VDD V

VI Input Voltage 0.3 to VDD +0.3 V

VO Output Voltage 0.3 to VDD +0.3 V
TSTG Storage Temperature 55 to + 150 C
IINJ Pin Injection Current Digital Input -5 to +5 mA
IINJ Pin Injection Current Analog Input -5 to +5 mA

Maximum Accumulated Pin injection Current in the device -50 to +50 mA

Note: Stresses above those listed as absolute maximum ratings may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect
device reliability. All voltages are referenced to V SS

RECOMMENDED OPERATING CONDITIONS

Value
Symbol Parameter Unit
Min. Max.
TA Operating Temperature 40 85 C
VDD Operating Supply Voltage 4.5 5.5 V
fOSCE External Oscillator Frequency 24 MHz
fOSCI Internal Clock Frequency (INTCLK) 12 MHz

13/56

ST9040

DC ELECTRICAL CHARACTERISTICS
VDD = 5V 10% TA = 40 C to + 85C, unless otherwise specified)
Value
Symbol Parameter Test Conditions Unit
Min. Typ. Max.
VIHCK Clock Input High Level External Clock 0.7 VDD VDD + 0.3 V
VILCK Clock Input Low Level External Clock 0.3 0.3 VDD V
TTL 2.0 VDD + 0.3 V
VIH Input High Level
CMOS 0.7 VDD VDD + 0.3 V
TTL 0.3 0.8 V
VIL Input Low Level
CMOS 0.3 0.3 VDD V
VIHRS RESET Input High Level 0.7 VDD VDD + 0.3 V
VILRS RESET Input Low Level 0.3 0.3 VDD V
VHYRS RESET Input Hysteresis 0.3 1.5 V
VOH Output High Level Push Pull, Iload = 0.8mA VDD 0.8 V
Push Pull or Open Drain,
VOL Output Low Level 0.4 V
Iload = 1.6mA
Weak Pull-up Current Bidirectional Weak Pull-
IWPU 50 200 420 A
up, VOL = 0V
Active Pull-up Current,
IAPU VIN < 0.8V, under Reset 80 200 420 A
for INT0 and INT7 only
Input/Tri-State,
ILKIO I/O Pin Input Leakage 10 + 10 A
0V < VIN < VDD
ILKRS Reset Pin Input Leakage 0V < VIN < VDD 30 + 30 A
Alternate Function,
A/D Pin Input Leakage
ILKAD Open Drain, 3 +3 A
0V < VIN < VDD
Active Pull-up Input
ILKAP 0V < VIN < 0.8V 10 + 10 A
Leakage
ILKOS OSCIN Pin Input Leakage 0V < VIN < VDD 10 + 10 A
Note: All I/O Ports are configured in Bidirectional Weak Pull-up Mode with no DC load, External Clock pin (OSCIN) is driven by square wave
external clock. No peripheral working.

DC TEST CONDITIONS

14/56

 ST9040

AC ELECTRICAL CHARACTERISTICS
(VDD = 5V 10% TA = 40 C to + 85C, unless otherwise specified)

Value
Symbol Parameter Test Conditions Unit
Min. Typ. Max.

Run Mode Current

IDD no CPUCLK prescale, 24MHz, Note 1 40 mA
Clock divide by 2

Run Mode Current

IDP2 Prescale by 2 24MHz, Note 1 30 mA
Clock divide by 2

WFI Mode Current

IWFI no CPUCLK prescale, 24MHz, Note 1 20 mA
Clock divide by 2

IHALT HALT Mode Current 24MHz, Note 1 100 A

Note 1: All I/O Ports are configured in Bidirectional Weak Pull-up Mode with no DC load, External Clock pin (OSCIN) is driven by square wave
external clock. No peripheral working.

15/56

ST9040

CLOCK TIMING TABLE

(VDD = 5V 10%, TA = 40C to + 85C, INTCLK = 12MHz, unless otherwise specified)

Value
N Symbol Parameter Unit Note
Min. Max.

1 TpC OSCIN Clock Period 41.5 ns 1

83 ns 2

2 TrC, TfC OSCIN Rise and Fall Time 12 ns

3 TwCL, TwCH OSCIN Low and High Width 17 25 ns 1

38 ns 2
Notes:
1. Clock divided by 2 internally (MODER.DIV2=1)
2. Clock not divided by 2 internally (MODER.DIV2=0)

CLOCK TIMING

16/56

 ST9040

EXTERNAL BUS TIMING TABLE

(VDD = 5V 10%,TA = 40 C to + 85 C, Cload = 50pF, CPUCLK = 12MHz, unless otherwise specified)
Value (Note)
N Symbol Parameter OSCIN Divided OSCIN Not Divided Unit
Min. Max.
By 2 By 2
Address Set-up Time
1 TsA (AS) TpC (2P+1) 22 TWCH+PTpC 18 20 ns
before AS
2 ThAS (A) Address Hold Time after AS TpC 17 TwCL 13 25 ns
3 TdAS (DR) AS to Data Available (read) TpC (4P+2W+4) 52 TpC (2P+W+2) 51 115 ns
4 TwAS AS Low Pulse Width TpC (2P+1) 7 TwCH+PTpC 3 35 ns
5 TdAz (DS) Address Float to DS t 12 12 12 ns
TwCH+TpC
6 TwDSR DS Low Pulse Width (read) TpC (4P+2W+3) 20 105 ns
(2P+W+1) 16
7 TwDSW DS Low Pulse Width (write) TpC (2P+2W+2) 13 TpC (P+W+1) 13 70 ns
TwCH+TpC(2P+W+1)
8 TdDSR (DR) DS toData Valid Delay (read) TpC (4P+2W-3) 50 75 ns
46
9 ThDR (DS) Data to DS Hold Time (read) 0 0 0 ns
10 TdDS (A) DS to Address Active Delay TpC 7 TwCL 3 35 ns
11 TdDS (AS) DS to AS Delay TpC 18 TwCL 14 24 ns
12 TsR/W (AS) R/W Set-up Time before AS TpC (2P+1) 22 TwCH+PTpC 18 20 ns
DS to R/W and Address Not
13 TdDSR (R/W) TpC 9 TwCL 5 33 ns
Valid Delay
Write Data Valid to DS Delay
14 TdDW (DSW) TpC (2P+1) 32 TwCH+PTpC 28 10 ns
(write)
15 ThDS (DW) Data Hold Time after DS (write) TpC 9 TwCL 5 33 ns
Address Valid to Data Valid TwCH+TpC
16 TdA (DR) TpC (6P+2W+5) 68 140 ns
Delay (read) (3P+W+2) 64
17 TdAs (DS) AS to DS Delay TpC 18 TwCL 14 24 ns

EXTERNAL WAIT TIMING TABLE

(VDD = 5V 10%,TA = 40C to +85C, Cload = 50pF,
INTCLK = 12MHz, Push-pull output configuration, unless otherwise specified)
Value (Note)
N Symbol Parameter OSCIN Divided OSCIN Not Divided Unit
Min. Max.
By 2 By 2
1 TdAs (WAIT) AS to WAIT Delay 2(P+1)TpC 29 2(P+1)TpC 29 40 ns
2 TdAs (WAIT) AS to WAIT Min. Delay 2(P+W+1)TpC 4 2(P+W+1)TpC 4 80 ns
83W+
3 TdAs (WAIT) AS to WAIT Max. Delay 2(P+W+1)TpC 29 2(P+W+1)TpC 29 ns
40
Note: (for both tables) The value in the left hand two columns show the formula used to calculate the timing minimum or maximum from the
oscillator clock period, prescale value and number of wait cycles inserted.
The value in the right hand two columns show the timing minimum and maximum for an external clock at 24 MHz divided by 2, prescaler value
of zero and zero wait status.
Legend: TpC =OSCIN Period
P = Clock Prescaling Value TwCH =High Level OSCIN half period
W = Wait Cycles TwCL =Low Level OSCIN half period

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ST9040

EXTERNAL BUS TIMING

EXTERNAL WAIT TIMING

18/56

 ST9040

HANDSHAKE TIMING TABLE (VDD = 5V 10%, TA = 40C to +85C, Cload = 50pF, INTCLK = 12MHz,
Push-pull output configuration, unless otherwise specified)

Value (Note)

N Symbol Parameter OSCIN Divided OSCIN Not Divided Min. Max. Unit
By 2 By 2

Min. Max. Min. Max.

RDRDY, WRRDY Pulse TpC

2TpC
1 TwRDY Width in One Line (P+W+1) 65 ns
(P+W+1) 18
Handshake 18

RDSTB, WRSTB Pulse

2 TwSTB 2TpC+12 TpC+12 95 ns
Width

TdST RDSTB, or WRSTB (TpC-TwCL)

3 TpC+45 87 ns
(RDY) to RDRDY or WRRDY +45

TwCH+
TsPD Port Data to RDRDY (2P+2W+1)
4 (W+P) 16 ns
(RDY) Set-up Time TpC 25
TpC 25

Port Data to WRRDY

TsPD
5 Set-up Time in One Line 43 43 43 ns
(RDY)
Handshake

Port Data to WRRDY

ThPD Hold
6 0 0 0 ns
(RDY) Time in One Line
Handshake

TsPD Port Data to WRSTB

7 10 10 10 ns
(STB) Set-up Time

ThPD Port Data to WRSTB

8 25 25 25 ns
(STB) Hold Time

RDSTBD to Port Data

TdSTB
9 Delay Time in 35 35 35 ns
(PD)
Bidirectional Handshake

RDSTB to Port High-Z

TdSTB
10 Delay Time in 25 25 25 ns
(PHZ)
Bidirectional Handshake

Note: The value in the left hand two columns show the formula used to calculate the timing minimum or maximum from the oscillator clock
period, prescale value and number of wait cycles inserted.
The value in the right hand two columns show the timing minimum and maximum for an external clock at 24 MHz divided by 2, prescaler value
of zero and zero wait status.

Legend:
P = Clock Prescaling Value (R235.4,3,2)
W = Programmable Wait Cycles (R252.2.1.0/5,4,3) + External Wait Cycles

19/56

ST9040

HANDSHAKE TIMING

20/56

 ST9040

BUS REQUEST/ACKNOWLEDGE TIMING TABLE (VDD = 5V 10%,TA = 40C to +85C, Cload = 50pF,
INTCLK = 12MHz, Push-pull output configuration, unless otherwise specified)

Value (Note)
N Symbol Parameter Unit
OSCIN Divided OSCIN Not Divided
Min. Max.
By 2 By 2

TpC+8 TwCL+12 50 ns
1 TdBR (BACK) BREQ to BUSACK
TpC(6P+2W+7)+65 TpC(3P+W+3)+TwCL+65 360 ns

2 TdBR (BACK) BREQ to BUSACK 3TpC+60 TpC+TwCL+60 185 ns

BUSACK to Bus
3 TdBACK (BREL) 20 20 20 ns
Release

BUSACK to Bus
4 TdBACK (BACT) 20 20 20 ns
Active
Note: The value left hand two columns show the formula used to calculate the timing minimum or maximum from the oscillator clock period,
prescale value and number of wait cycles inserted.
The value right hand two columns show the timing minimum and maximum for an external clock at 24MHz divided by 2, prescale value of zero
and zero wait status.

BUS REQUEST/ACKNOWLEDGE TIMING

Note : MEMINT = Group of memory interface signals: AS, DS, R/W, P00-P07, P10-P17

21/56

ST9040

EXTERNAL INTERRUPT TIMING TABLE (VDD = 5V 10%, TA = 40C to +85C, Cload = 50pF,
INTCLK = 12MHz, Push-pull output configuration, unless otherwise specified)

Value (Note)

N Symbol Parameter OSCIN OSCIN Not Unit

Divided By Divided By Min. Max.
2 Min. 2 Min.

1 TwLR Low Level Minimum Pulse Width in Rising Edge Mode 2TpC+12 TpC+12 95 ns

2 TwHR High Level Minimum Pulse Width in Rising Edge Mode 2TpC+12 TpC+12 95 ns

3 TwHF High Level Minimum Pulse Width in Falling Edge Mode 2TpC+12 TpC+12 95 ns
4 TwLF Low Level Minimum Pulse Width in Falling Edge Mode 2TpC+12 TpC+12 95 ns
Note: The value left hand two columns show the formula used to calculate the timing minimum or maximum from the oscillator clock period,
prescale value and number of wait cycles inserted.
The value right hand two columns show the timing minimum and maximum for an external clock at 24 MHz divided by 2, prescale value of zero
and zero wait status.

EXTERNAL INTERRUPT TIMING

22/56

 ST9040

SPI TIMING TABLE (VDD = 5V 10%, T A = 40C to +85C, Cload = 50pF, INTCLK = 12MHz,
Output Alternate Function set as Push-pull)

Value
N Symbol Parameter Unit
Min. Max.

1 TsDI Input Data Set-up Time 100 ns

2 ThDI (1) Input Data Hold Time 1/2 TpC+100 ns

3 TdOV SCK to Output Data Valid 100 ns

4 ThDO Output Data Hold Time -20 ns

5 TwSKL SCK Low Pulse Width 300 ns

6 TwSKH SCK High Pulse Width 300 ns
Note: TpC is the OSCIN Clock period.

SPI TIMING

23/56

ST9040

WATCHDOG TIMING TABLE(VDD = 5V 10%, TA = 40 C to +85C, Cload = 50pF,

CPUCLK = 12MHz, Push-pull output configuration, unless otherwise specified )

Values
N Symbol Parameter Unit
Min. Max.

1 TwWDOL WDOUT Low Pulse Width 620 ns

2 TwWDOH WDOUT High Pulse Width 620 ns

3 TwWDIL WDIN High Pulse Width 350 ns

4 TwWDIH WDIN Low Pulse Width 350 ns

WATCHDOG TIMING

24/56

 ST9040

A/D CONVERTER
EXTERNAL TRIGGER TIMING (VDD = 5V 10%, TA = 40C to +85C, Cload = 50pF)

Oscin divided Oscin not

Value(2)
N Symbol Parameter by 2 (1) divided (1) Unit
Min. Max. Min. Max. Min. Max.

1 TLOW External Trigger pulse width 2xT PC TPC 83 ns

2 THIGH External Trigger pulse 2xT PC TPC 83 ns

External trigger active

3 TEXT 138xTPC 69xTPC 5.75 s
edges distance

Internal delay between

4 TSTR EXTRG falling edge and first TPC 3xTPC 0.5xTPC 1.5xTPC 41.5 125 ns
conversion start
Notes:
1. Variable clock (TPC=OSCIN clock period)
2. INTCLK=12MHz

A/D External Trigger Timing

25/56

ST9040

A/D INTERNAL TRIGGER TIMING TABLE

OSCIN OSCIN
Value (3)
N Symbol Parameter Divided by 2 (2) Not Divided by 2 (2) Unit

Min. Max. Min. Max. Min. Max.

Internal trigger
1 TwHIGH Tpc .5 x Tpc 41.5 - ns
pulse width

Internal trigger
2 TwLOW 6 x Tpc 3 x Tpc 250 - ns
pulse distance

Internal trigger
3 TwEXT active edges 276n x Tpc 138n x Tpc n x 11.5 - s
distance (1)

Internal delay
between INTRG
4 TwSTR rising edge and Tpc 3 x Tpc .5 x Tpc 1.5 x Tpc 41.5 125 ns
first conversion
start

A/D INTERNAL TRIGGER TIMING

26/56

 ST9040

A/D CHANNEL ENABLE TIMING TABLE

OSCIN OSCIN
Value (3)
N Symbol Parameter Divided by 2 (2) Not Divided by 2 (2) Unit

Min. Max. Min. Max. Min. Max.

CEn Pulse width

1 TwEXT 276n x Tpc 138n x Tpc n x 11.5 - s
(1)

Notes:
1. n = number of autoscanned channels (1 < n < 8)
2. Variable clock (Tpc = OSCIN clock period)
3. CPUCLK = 12MHz

A/D CHANNEL ENABLE TIMING

27/56

ST9040

A/D ANALOG SPECIFICATIONS

Parameter Typical (1) Minimum Maximum Units (2) Notes

Analog Input Range AVCC

V
A VCC 3 VCC

Conversion time 11.5 s (3, 4)

Sample time 3 s (3)

Power-up time 60 s

Resolution 8 8

Monotonicity GUARANTEED

No missing codes GUARANTEED

Zero input reading 00 Hex

Full scale reading FF Hex

Offset error .5 1 LSBs (2,6)

Gain error .5 1 LSBs (6)

Diff. Non Linearity .3 .2 .5 LSBs (6)

Int. Non Linearity 1 LSBs (6)

Absolute Accuracy 1 LSBs (6)

S/N 45 49 dB

AVCC/AVSS Resistance 13.5 16 11 K

Input Resistance 12 8 15 K (5)

Hold Capacitance 30 pF

Input Leakage 3 A

Notes:
1. The values are expected at 25 degree Centigrade with AVCC = 5V
2. LSBs, as used here, has a value of AVCC/256
3. @ 12MHz internal clock
4. Including sample time
5. It must be intended as the internal series resistance before the sampling capacitor
6. This is a typical expected value, but not a tested production parameter.
If V(i) is the value of the i-th transition level (0 < i < 254), the performance of the A/D co nverter has been valued as follows:
OFFSET ERROR = deviation between the actual V(0) and the ideal V(0) (=1/2 LSB)
GAIN ERROR = deviation between the actual V(254) and the ideal V(254) (=AVCC-3/2 LSB)
DNL ERROR = max {[V(i) - V(i-1)]/LSB - 1}
INL ERROR = max {[V(i) - V(0)]/LSB - i}

28/56

 ST9040

MULTIFUNCTION TIMER UNIT EXTERNAL TIMING TABLE

OSCIN OSCIN Value (4)

Divided Not
N Symbol Parameter by 2 Divided Unit Note
by 2 Min. Max.
(3) (3)

1 TwCTW External clock/trigger pulse width 2n x Tpc n x Tpc n x 83 - ns 1

2 TwCTD External clock/trigger pulse distance 2n x Tpc n x Tpc n x 83 - ns 1

3 TwAED Distance between two active edges 6 x Tpc 3 x Tpc 249 - ns

4 TwGW Gate pulse width 12 x Tpc 6 x Tpc 498 - ns

Distance between TINB pulse edge and

5 TwLBA 2 x Tpc Tpc 83 - ns 2
the following TINA pulse edge

Distance between TINA pulse edge and

6 TwLAB 0 0 - ns 2
the following TINB pulse edge

7 TwAD Distance between two TxINA pulses 0 0 - ns 2

8 TwOWD Minimum output pulse width/distance 6 x Tpc 3 x Tpc 249 - ns

Notes: 2.In Autodiscrimination mode

1. n = 1 if the input is rising OR falling edge sensitive 3.Variable clock ( Tpc = OSCIN period )
n = 3 if the input is rising AND falling edge sensitive 4.INTCLK = 12 MHz

MULTIFUNCTION TIMER UNIT EXTERNAL TIMING

29/56

ST9040

SCI TIMING TABLE

(VDD = 5V 10%, TA = - 40C to +85C, Cload = 50pF, INTCLK = 12MHz,
Output Alternate Function set as Push-pull)
Value
N Symbol Parameter Condition Unit
Min. Max.

1 x mode FCK/8 Hz
FRxCKIN Frequency of RxCKIN
16 x mode FCK/4 Hz

TwRxCKIN 1 x mode 4 TCK s

RxCKIN shortest pulse
16 x mode 2 TCK s

1 x mode FCK/8 Hz
FTxCKIN Frequency of TxCKIN
16 x mode FCK/4 Hz

TwTxCKIN 1 x mode 4 TCK s

TxCKIN shortest pulse
16 x mode 2 TCK s
DS (Data Stable) before rising
1 TsDS 1 x mode reception with RxCKIN TPC/2 ns
edge of RxCKIN
1 x mode transmission with
2 TdD1 TxCKIN to Data out delay Time 2.5 TPC ns
external clock C load <100pF
1 x mode transmission with
3 TdD2 CLKOUT to Data out delay Time 350 ns
CLKOUT

Note: FCK = 1/TCK

SCI TIMING

30/56

 ST9040

PACKAGE MECHANICAL DATA

80-Pin Plastic Quad Flat Package

Dim. mm inches
Min Typ Max Min Typ Max
A 3.40 0.134
A2 2.55 2.80 3.05 0.100 0.110 0.120
D 22.95 23.20 24.45 0.903 0.913 0.923
D1 19.90 20.00 20.10 0.783 0.787 0.791
D3 18.40 0.724
E 16.95 17.20 17.45 0.667 0.677 0.687
E1 13.90 14.00 14.10 0.547 0.551 0.555
E3 12.00 0.472
e 0.80 0.032
Number of Pins
N 80
ND 24
NE 16

Short Footprint Measurement Short Footprint recommended Padding

31/56

ST9040

68-Pin Plastic Leadless Chip Carrier

Dim. mm inches
Min Typ Max Min Typ Max
A 4.20 5.08 0.165 0.200
A1 0.51 0.020
A3 2.29 3.30 0.090 0.130
B - - - - - -
B1 - - - - - -
D 25.02 25.27 0.985 0.995
D1 24.13 24.33 0.950 0.958
D3 20.32 0.800
E 25.02 25.27 0.985 0.995
E1 24.13 24.33 0.950 0.958
E3 20.32 0.800
K1 - - - - - -
h
e 1.27 0.050
Number of Pins
N 68
ND 16
NE 16

ORDERING INFORMATION
Sales Type Frequency Temperature Range Package
ST9040Q1/XX PQFP80
0C to + 70C
ST9040C1/XX 24MHz PLCC68
ST9040C6/XX -40C to + 85C PLCC68
Note: XX is the ROM code identifier that is allocated by SGS-THOMSON after receipt of all requi red options and the related ROM file.

32/56

 ST9040

ST9040 STANDARD OPTION LIST

Please copy this page (enlarge if possible) and complete ALL sections.
Send the form, with the ROM code image required, to your local SGS-THOMSON sales office.

Customer Company : [. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ]
Company Address : [. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ]
[. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ]
Telephone : [. . . . . . . . . . . . . . . . . . . . . . . . . . ]
FAX : [. . . . . . . . . . . . . . . . . . . . . . . . . . ]
Contact : [. . . . . . . . . . . . . . . . . . . . . . . . . . ] Telephone (Direct) : [. . . . . . . . . . . . . . . . . . . . . . . . . . ]

Please confirm characteristics of device :

Device ST9040

Package [ ] PQFP80 [ ] PLCC68

Temperature Range [ ] -40C to +85C [ ] 0C to +70C

Special Marking [ ] No
[ ] Yes 14 characters [ | | | | | | | | | | | | | ]
Authorized characters are letters, digits, ., -, / and spaces only.
Please consult your local SGS-THOMSON sales office for other marking details if required.
Notes :

Code : [ ] EPROM (27128, 27256)

[ ] HEX format files on IBM-PC compatible disk
filename : [. . . . . . . . . . . . . . . . . . . . . . ]

Confirmation : [ ] Code checked with EPROM device in application

Yearly Quantity forecast : [. . . . . . . . . . . . . . . . . . . . . . . . . . . ] k units

- for a period of : [. . . . . . . . . . . . . . . . . . . . . . . . . . . ] years

Preferred Production start dates : [. .. . . . . . . . . . . . . . . . . . . . . ] (YY/MM/DD)

Customer Signature :
Date :

33/56

ST9040

NOTES :

34/56

 ST90E40
ST90T40
16K EPROM HCMOS MCU
WITH EEPROM, RAM AND A/D CONVERTER

Register oriented 8/16 bit CORE with

RUN, WFI and HALT modes
Minimum instruction cycle time: 500ns
(12MHz internal)
Internal Memory :
EPROM 16Kbytes
RAM 256 bytes
EEPROM 512 bytes PQFP80
224 general purpose registers available as
RAM, accumulators or index pointers
(Register File)
80-pin Plastic Quad Flat Pack package for
ST90T40Q
68-lead Plastic Leaded Chip Carrier package for
ST90T40C
80-pin Windowed Ceramic Quad Flat Pack PLCC68
package for ST90E40G
68-lead Windowed Ceramic LeadedChip Carrier
package for ST90E40L
DMA controller, Interrupt handler and Serial Pe-
ripheral Interface as standard features
56 fully programmable I/O pins
Up to 8 external plus 1 non-maskableinterrupts
16 bit Timer with 8 bit Prescaler, able to be used CQFP80W
as a WatchdogTimer
Two 16 bit Multifunction Timers, each with an 8
bit prescaler and 13 operating modes
8 channel 8 bit Analog to Digital Converter, with
Analog Watchdogs and external references
Serial Communications Interface with asynchro-
nous and synchronous capability
CLCC68W
Rich Instruction Set and 14 Addressingmodes
Division-by-Zero trap generation
Versatile Development tools,including assembler, (Ordering Information at the end of the Datasheet)
linker, C-compiler, archiver, graphic oriented de-
buggerand hardware emulators
Real Time Operating System
Compatible with ST9036 and ST9040 16K ROM
devices

March 1994 35/56

ST90E40 - ST90T40

Figure 1. 80 Pin QFP Package

Table 1. ST90E40G-ST90T40QPin Description

Pin Name Pin Name Pin Name Pin Name
1 AVSS 25 P34/T1INA 64 P20/NMI 80 AVDD
2 NC 26 P33/T0OUTB 63 NC 79 NC
3 NC 27 P32/T0INB 62 VSS 78 P47/AIN7
4 P44/AIN4 28 P31/T0OUTA 61 P70/SIN 77 P46/AIN6
5 P57 29 P30/P/D/T0INA 60 P71/SOUT 76 P45/AIN5
6 P56 30 P17/A15 P72/INT4/TXCLK 75 P43/AIN3
59
7 P55 31 P16/A14 /CLKOUT 74 P42/AIN2
8 P54 32 NC P73/INT5 73 P41/AIN1
58
9 INT7 33 P15/A13 /RXCLK/ADTRG 72 P40/AIN0
10 INT0 34 P14/A12 57 P74/P/D/INT6 71 P27/RRDY5
11 P53 35 P13/A11 56 P75/WAIT P26/INT3
70
12 NC 36 P12/A10 P76/WDOUT /RDSTB5/P/D
55
13 P52 37 P11/A9 /BUSREQ 69 P25/WRRDY5
14 P51 38 P10/A8 P77/WDIN P24/INT1
54 68
15 P50 39 P00/A0/D0 /BUSACK /WRSTB5
16 OSCOUT 40 P01/A1/D1 53 R/W 67 P23/SDO
17 VSS 52 NC 66 P22/INT2/SCK
18 VSS 51 DS 65 P21/SDI/P/D
19 NC 50 AS
20 OSCIN 49 NC
21 RESET/VPP 48 VDD
22 P37/T1OUTB 47 VDD
23 P36/T1INB 46 P07/A7/D7
24 P35/T1OUTA 45 P06/A6/D6
44 P05/A5/D5
43 P04/A4/D4
42 P03/A3/D3
41 P02/A2/D2

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 ST90E40 - ST90T40

Figure 2. 68 Pin LCC Package

Table 2. ST90E40L-ST90T40C
Pin Name Pin Name Pin Name Pin Name
61 P44/AIN4 10 P35/T1OUTA 43 P70/SIN 60 AVSS
62 P57 11 P34/T1INA 42 P71/SOUT 59 AVDD
63 P56 12 P33/T0OUTB P72/CLKOUT 58 P47/AIN7
41
64 P55 13 P32/T0INB /TXCLK/INT4 57 P46/AIN6
65 P54 14 P31/T0OUTA P73/ADTRG 56 P45/AIN5
40
66 INT7 15 P30/P/D/T0INA /RXCLK/INT5 55 P43/AIN3
67 INT0 16 P17/A15 39 P74/P/D/INT6 54 P42/AIN2
68 P53 17 P16/A14 38 P75/WAIT 53 P41/AIN1
1 P52 18 P15/A13 P76/WDOUT 52 P40/AIN0
37
2 P51 19 P14/A12 /BUSREQ 51 P27/RRDY5
3 P50 20 P13/A11 P77/WDIN P26/INT3
36 50
4 OSCOUT 21 P12/A10 /BUSACK /RDSTB5/P/D
5 VSS 22 P11/A9 35 R/W 49 P25/WRRDY5
6 OSCIN 23 P10/A8 34 DS P24/INT1
48
7 RESET/VPP 24 P00/A0/D0 33 AS /WRSTB5
8 P37/T1OUTB 25 P01/A1/D1 32 VDD 47 P23/SDO
9 P36/T1INB 26 P02/A2/D2 31 P07/A7/D7 46 P22/INT2/SCK
30 P06/A6/D6 45 P21/SDI/P/D
29 P05/A5/D5 44 P20/NMI
28 P04/A4/D4
27 P03/A3/D3

37/56

ST90E40 - ST90T40

1.1 GENERAL DESCRIPTION

The ST90E40 and ST90T40 (following mentioned The nucleus of the ST90E40 is the advanced Core
as ST90E40)are EPROM members ofthe ST9 fam- which includes the Central Processing Unit (CPU),
ilyof microcontrollers, in windowed ceramic (E) and the Register File, a 16 bit Timer/Watchdog with 8
plastic OTP (T) packages respectively, completely bit Prescaler, a Serial Peripheral Interface support-
developed and produced by SGS-THOMSON Mi- ing S-bus, I2C-bus and IM-bus Interface,plus two 8
croelectronics using a n-well proprietary HCMOS bit I/O ports. The Core has independent memory
process. and register buses allowing a high degree of pipe-
The EPROM parts are fully compatible with their lining to add to the efficiency of the code execution
ROM versions and this datasheet will thus provide speed of the extensive instruction set.
only information specific to the EPROM based de- The powerful I/O capabilities demanded by micro-
vices. controller applications are fulfilled by the ST90E40
THE READER IS ASKED TO REFER TO THE with up to 56 I/O lines dedicated to digital In-
DATASHEET OF THE ST9040 ROM-BASED DE- put/Output. These lines are grouped into up to
VICE FOR FURTHER DETAILS. seven 8 bit I/O Ports and can be configured on a bit
basis under software control to provide timing,
The EPROM ST90E40 may be used for the proto- status signals, an address/data bus for interfacing
typing and pre-production phases of development, external memory, timer inputs and outputs, analog
and can be configured as: a standalone microcon- inputs, external interrupts and serial or parallel I/O
troller with 16K bytes of on-chip EPROM, a micro- with or without handshake.
controller able to manageexternal memory, or as a
parallel processing element in a system with other
processors and peripheral controllers.

Figure 3. ST90E40 Block Diagram

INT0 INT7
8

1 6-Bit TIMER / WATCHDOG + SPI

16k Bytes 512 Bytes 256 Bytes 256 Bytes SCI I/O PORT 7
( SCI )
EPROM EEPROM RAM REGISTER FILE
CPU WITH DMA

MEMORY BUS

REGISTER BUS

I/O PORT 0 I/O PORT 1 I/O PORT 2 I/O PORT 3 2 x 16-bit TIMER I/O PORT 4 A /D I/O PORT 5
( Address/Data ) ( Address ) ( SPI ) ( TIMERS ) W ITH DM A ( Ana log Inpu ts ) CONVERTER WITH HANDSHAKE

8 8 8 8 8 8
AVD D AVS S

VR0A1385

38/56

 ST90E40 - ST90T40

GENERAL DESCRIPTION (Continued)

Three basic memory spaces are available to sup- In addition there is an 8 channel Analog to Digital
port this wide range of configurations: Program Converter with integral sample and hold, fast 11s
Memory (internal and external),Data Memory (ex- conversion time and 8 bit resolution. An Analog
ternal) and the Register File, which includes the Watchdog feature is included for two input chan-
control and status registers of the on-chip peripher- nels.
als. Completing the device is a full duplex Serial Com-
Two 16 bit MultiFunction Timers, each with an 8 bit munications Interface with an integral 110 to
Prescaler and 13 operating modes allow simple 375,000 baud rate generator, asynchronous and
use for complex waveform generation and meas- 1.5Mbyte/s synchronous capability (fully program-
urement, PWM functions and many other sys- mable format) and associated address/wake-up
temmsiming functions by the usage of the two option, plus two DMA channels.
associated DMA channels for each timer.

1.2 PIN DESCRIPTION

AS. Address Strobe (output, active low, 3-state). OSCIN, OSCOUT. Oscillator (input and output).
Address Strobe is pulsed low once at the begin- These pins connect a parallel-resonant crystal
ning of each memory cycle. The rising edge of AS (24MHz maximum), or an external source to the
indicates that address, Read/Write (R/W), and on-chip clock oscillator and buffer. OSCIN is the in-
Data Memory signals are valid for program or data put of the oscillator inverter and internal clock gen-
memory transfers. Under program control, AS can erator; OSCOUT is the output of the oscillator
be placed in a high-impedance state along with inverter.
Port 0 and Port 1, Data Strobe (DS) and R/W.
AVDD. Analog VDD of the Analog to Digital Con-
DS. Data Strobe (output, active low, 3-state). Data verter.
Strobe provides the timing for data movement to or
from Port 0 for each memory transfer. During a write AVSS. Analog VSS of the Analog to Digital Con-
cycle, data out is valid at the leading edge of DS. verter. Must be tied to VSS.
During a readcycle, DataIn must be valid prior to the VDD. Main Power Supply Voltage (5V 10%)
trailing edge of DS. When the ST9040 accesseson- VSS. Digital Circuit Ground.
chipmemory, DS is held high duringthe wholemem-
ory cycle. It can be placed in a high impedancestate P0.0-P0.7, P1.0-P1.7, P2.0-P2.7 P3.0-P3.7, P4.0-
along with Port 0, Port 1, AS andR/W. P4.7, P5.0-P5.7, P7.0-P7.7 I/O Port Lines (In-
put/Output, TTL or CMOS compatible). 56 lines
R/W. Read/Write (output, 3-state). Read/Write de- grouped into I/O ports of 8 bits, bit programmable
termines the direction of data transfer for external under program control as general purpose I/O or
memorytransactions.R/W is low when writing to ex- as alternate functions.
ternal program or data memory,and high for all other
transactions. It can be placed in a high impedance
state along with Port 0, Port 1, AS and DS. 1.2.1 I/O PORT ALTERNATE FUNCTIONS
RESET/VPP. Reset (input, active low) or VPP (in- Each pin of the I/O ports of the ST90E40/T36 may
put). The ST9 is initialised by the Reset signal. assume software programmable Alternative Func-
With the deactivation of RESET, program execu- tions as shown in the Pin Configuration Tables.
tion begins from the Program memory location Due to Bonding options for the packages, some
pointed to by the vector contained in program functions may not be present, Table 3 shows the
memory locations 00h and 01h. In the EPROM Functions allocatedto each I/O Port pin and a sum-
programming Mode, this pin acts as the program- mary of packages for which they are available.
ming voltage input VPP.
iNT0, INT7. Externalinterrupts (input, active on ris-
ing or falling edge). External interrupt inputs 0 and
7 respectively. INT0 channel may also be used for
the timer watchdog interrupt.

39/56

ST90E40 - ST90T40

PIN DESCRIPTION (Continued)

Table 3. ST90E40, T40 I/O Port Alternate Function Summary

I/O PORT Name Function Alternate Function Pin Assignment
Port. bit PLCC PQFP
P0.0 A0/D0 I/O Address/Data bit 0 mux 24 39
P0.1 A1/D1 I/O Address/Data bit 1 mux 25 40
P0.2 A2/D2 I/O Address/Data bit 2 mux 26 41
P0.3 A3/D3 I/O Address/Data bit 3 mux 27 42
P0.4 A4/D4 I/O Address/Data bit 4 mux 28 43
P0.5 A5/D5 I/O Address/Data bit 5 mux 29 44
P0.6 A6/D6 I/O Address/Data bit 6 mux 30 45
P0.7 A7/D7 I/O Address/Data bit 7 mux 31 46
P1.0 A8 O Address bit 8 23 38
P1.1 A9 O Address bit 9 22 37
P1.2 A10 O Address bit 10 21 36
P1.3 A11 O Address bit 11 20 35
P1.4 A12 O Address bit 12 19 34
P1.5 A13 O Address bit 13 18 33
P1.6 A14 O Address bit 14 17 31
P1.7 A15 O Address bit 15 16 30
P2.0 NMI I Non-Maskable Interrupt 44 64
P2.0 ROMless I ROMless Select (Mask option) 44 64
P2.1 P/D O Program/Data Space Select 45 65
P2.1 SDI I SPI Serial Data Out 45 65
P2.2 INT2 I External Interrupt 2 46 66
P2.2 SCK O SPI Serial Clock 46 66
P2.3 SDO O SPI Serial Data In 47 67
P2.4 INT1 I External Interrupt 1 48 68
P2.4 WRSTB5 I Handshake Write Strobe P5 48 68
P2.5 WRRDY5 O Handshake Write Ready P5 49 69
P2.6 INT3 I External Interrupt 3 50 70
P2.6 RDSTB5 I Handshake Read Strobe P5 50 70
P2.6 P/D O Program/Data Space Select 50 70
P2.7 RDRDY5 O Handshake Read Ready P5 51 71
P3.0 T0INA I MF Timer 0 Input A 15 29
P3.0 P/D O Program/Data Space Select 15 29
P3.1 T0OUTA O MF Timer 0 Output A 14 28
P3.2 T0INB I MF Timer 0 Input B 13 27
P3.3 T0OUTB O MF Timer 0 Output B 12 26
P3.4 T1INA I MF Timer 1 Input A 11 25

40/56

 ST90E40 - ST90T40

PIN DESCRIPTION (Continued)

Table 4. ST90E40, T40 I/O Port Alternate Function Summary

I/O PORT Name Function Alternate Function Pin Assignment
Port. bit PLCC PQFP
P3.5 T1OUTA O MF Timer 1 Output A 10 24
P3.6 T1INB I MF Timer 1 Input B 9 23
P3.7 T1OUTB O MF Timer 1 Output B 8 22
P4.0 Ain0 I A/D Analog Input 0 52 72
P4.1 Ain1 I A/D Analog Input 1 53 73
P4.2 Ain2 I A/D Analog Input 2 54 74
P4.3 Ain3 I A/D Analog Input 3 55 75
P4.4 Ain4 I A/D Analog Input 4 61 4
P4.5 Ain5 I A/D Analog Input 5 56 76
P4.6 Ain6 I A/D Analog Input 6 57 77
P4.7 Ain7 I A/D Analog Input 7 58 78
P5.0 I/O I/O Handshake Port 5 3 15
P5.1 I/O I/O Handshake Port 5 2 14
P5.2 I/O I/O Handshake Port 5 1 13
P5.3 I/O I/O Handshake Port 5 68 11
P5.4 I/O I/O Handshake Port 5 65 8
P5.5 I/O I/O Handshake Port 5 64 7
P5.6 I/O I/O Handshake Port 5 63 6
P5.7 I/O I/O Handshake Port 5 62 5
P7.0 SIN I SCI Serial Input 43 61
P7.1 SOUT O SCI Serial Output 42 60
P7.1 ROMless I ROMless Select (Mask option) 42 60
P7.2 INT4 I External Interrupt 4 41 59
P7.2 TXCLK I SCI Transmit Clock Input 41 59
P7.2 CLKOUT O SCI Byte Sync Clock Output 41 59
P7.3 INT5 I External Interrupt 5 40 58
P7.3 RXCLK I SCI Receive Clock Input 40 58
P7.3 ADTRG I A/D Conversion Trigger 40 58
P7.4 INT6 I External Interrupt 6 39 57
P7.4 P/D O Program/Data Space Select 39 57
P7.5 WAIT I External Wait Input 38 56
P7.6 WDOUT O T/WD Output 37 55
P7.6 BUSREQ I External Bus Request 37 55
P7.7 WDIN I T/WD Input 36 54
P7.7 BUSACK O External Bus Acknowledge 36 54

41/56

ST90E40 - ST90T40

1.1 MEMORY 1.2 EPROM PROGRAMMING

The memory of the ST90E40is functionallydivided The 16384 bytes of EPROM memory of the
into two areas, the Register File and Memory. The ST90E40 (16320 for the ST90T40) may be pro-
Memory is divided into two spaces, each having a grammed by using the EPROM Programming
maximum of 65,536 bytes. The two memory Boards (EPB) available from SGS-THOMSON.
spaces are separated by function, one space for 1.2.1 Eprom Erasing
Program code, the other for Data. The ST90E40
16K bytes of on-chip EPROM memory are se- The EPROM of the windowed package of the
lected at memory addresses 0 through 3FFFh ST90E40may be erased by exposureto Ultra-Violet
(hexadecimal) in the PROGRAM space, while the light.
ST90T40 OTP version has the top 64 bytes of the The erasure characteristic of the ST90E40 is such
EPROM reserved by SGS-THOMSON for testing that erasure begins when the memory is exposed
purposes. The DATA space includes the 512 bytes to light with a wave lengths shorter than approxi-
of on-chip EEPROM at addresses 0 through 1FFh mately 4000. It should be noted that sunlight and
and the 256 bytes of on-chip RAM memory at some types of fluorescent lamps have wave-
memory addresses 200h through 2FFh. lengths in the range 3000-4000. It is thus recom-
WARNING. The ST90T40has its 64 upper bytes in mended that the window of the ST90E40
the internal EPROM reserved for testing purpose. packages be covered by an opaque label to pre-
vent unintentional erasure problems when testing
External memory may be addressed using the mul- the application in such an environment.
tiplexed address and data buses (Alternate Func-
tions of Ports 0 and 1). At addresses greater than The recommended erasure procedure of the
the first 16K of program space, the ST90E40 exe- EPROM is the exposure to short wave ultraviolet
cutes external memory cycles for instruction light which have a wave-length 2537. The inte-
fetches. Additional Data Memory may be decoded grated dose (i.e. U.V. intensity x exposuretime) for
externally by using the P/D Alternate Function out- erasure should be a minimum of 15W-sec/cm2.
put. The on-chip general purpose (GP) Registers The erasure time with this dosage is approximately
may also be used as RAM memory for minimum 15 to 20 minutes using an ultraviolet lamp with
chip count systems. 12000W/cm2 power rating. The ST90E40 should
be placed within 2.5cm (1Inch) of the lamp tubes
during erasure.
Figure 4. Memory Spaces

42/56

 ST90E40 - ST90T40

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit
VDD Supply Voltage 0.3 to 7.0 V
AVDD, AVSS Analog Supply Voltage VSS = AVSS < AVDD VDD V
VI Input Voltage 0.3 to VDD +0.3 V
VO Output Voltage 0.3 to VDD +0.3 V
VPP Input Voltage on VPP Pin -0.3 to 13.5 V
TSTG Storage Temperature 55 to + 150 C
IINJ Pin Injection Current Digital -5 to 5 mA
IINJ Pin Injection Current Analog -5 to 5 mA
Maximum accumulated pin injection Current in the device -50 to 50 mA
Note: Stresses above those listed as absolute maximum ratings may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect
device reliability. All voltages are referenced to V SS

RECOMMENDED OPERATING CONDITIONS

Value
Symbol Parameter Unit
Min. Max.
TA Operating Temperature 40 85 C
VDD Operating Supply Voltage 4.5 5.5 V
fOSCE External Oscillator Frequency 24 MHz
fOSCI Internal Clock Frequency (INTCLK) 12 MHz

DC ELECTRICAL CHARACTERISTICS
VDD = 5V 10% TA = 40C to + 85C, unless otherwise specified)
Value
Symbol Parameter Test Conditions Unit
Min. Typ. Max.
VIHCK Clock Input High Level External Clock 0.7 VDD VDD + 0.3 V
VILCK Clock Input Low Level External Clock 0.3 0.3 VDD V
TTL 2.0 VDD + 0.3 V
VIH Input High Level
CMOS 0.7 VDD VDD + 0.3 V
TTL 0.3 0.8 V
VIL Input Low Level
CMOS 0.3 0.3 VDD V
VIHRS RESET Input High Level 0.7 VDD VDD + 0.3 V
VILRS RESET Input Low Level 0.3 0.3 VDD V
VHYRS RESET Input Hysteresis 0.3 1.5 V
VOH Output High Level Push Pull, Iload = 0.8mA VDD 0.8 V
Push Pull or Open Drain,
VOL Output Low Level 0.4 V
Iload = 1.6mA

43/56

ST90E40 - ST90T40

DC ELECTRICAL CHARACTERISTICS (continued)

Value
Symbol Parameter Test Conditions Unit
Min. Typ. Max.
Weak Pull-up Current Bidirectional Weak Pull-
IWPU 50 200 420 A
up, VOL = 0V
Active Pull-up Current,
IAPU VIN < 0.8V, under Reset 80 200 420 A
for INT0 and INT7 only
Input/Tri-State,
ILKIO I/O Pin Input Leakage 10 + 10 A
0V < VIN < VDD
ILKRS Reset Pin Input Leakage 0V < VIN < VDD 30 + 30 A
Alternate Function,
A/D Pin Input Leakage
ILKAD Open Drain, 3 +3 A
0V < VIN < VDD
Active Pull-up Input
ILKAP 0V < VIN < 0.8V 10 + 10 A
Leakage
ILKOS OSCIN Pin Input Leakage 0V < VIN < VDD 10 + 10 A
EPROM Programming
VPP 12.2 12.5 12.8 V
Voltage
EPROM Programming
IPP 30 mA
Current

DC TEST CONDITIONS

44/56

 ST90E40 - ST90T40

AC ELECTRICAL CHARACTERISTICS
(VDD = 5V 10% TA = 40C to + 85C, unless otherwise specified)

Value
Symbol Parameter Test Conditions Unit
Min. Typ. Max.

Run Mode Current

IDD no CPUCLK prescale, 24MHz 40 mA
Clock divide by 2

Run Mode Current

IDP2 Prescale by 2 24MHz 30 mA
Clock divide by 2

WFI Mode Current

IWFI no CPUCLK prescale, 24MHz 20 mA
Clock divide by 2

IHALT HALT Mode Current 24MHz 50 100 A

45/56

ST90E40 - ST90T40

PACKAGE MECHANICAL DATA

80-Pin Ceramic Quad Flat Package with Window

Dim. mm inches
Min Typ Max Min Typ Max
A 3.55 0.14
A2 3.40 0.133
D 23.90 0.941
D1 20.00 0.787
D3 18.40 0.724
E 17.90 0.705
E1 14.00 0.551
E3 12.00 0.472
7.62 0.3
e 0.80 0.032
Number of Pins
N 80
ND 24
NE 16

68-Pin Ceramic Leadless Chip Carrier with Window

Dim. mm inches
Min Typ Max Min Typ Max
A 4.47 0.176
A1 0.89 0.035
A3 - -
B 0.48 0.019
B1 - -
D 25.1 0.990
D1 23.6 0.930
D3 20.3 0.800
E 25.1 0.990
E1 23.6 0.930
E3 20.3 0.800
8 0.32
e 1.27 0.050
Number of Pins
N 68
ND 16
NE 16

46/56

 ST90E40 - ST90T40

ORDERING INFORMATION
Sales Type Frequency Temperature Range Package
(1)
ST90E40L0 CLCC68W
25C
(1)
ST90E40G0 CQFP80W
24MHz
ST90T40C6 -40C to + 85C PLCC68
ST90T40Q1 0C to + 70C PQFP80
Note . EPROM parts are tested at 25C only

47/56

ST90E40 - ST90T40

Notes:

48/56

 ST90R40
ROMLESS HCMOS MCU
WITH EEPROM, RAM AND A/D CONVERTER

Register oriented 8/16 bit CORE with

RUN, WFI and HALT modes
Minimum instruction cycle time:500ns
(12MHz internal)
ROMless to allow maximum external memory
flexibility
Internal Memory :
RAM 256 bytes PLCC68
EEPROM 512 bytes
224 general purpose registers available as
RAM, accumulators or index pointers
(register file)
68-lead Plastic Leaded Chip Carrier package for (Ordering Information at the end of the Datasheet)
ST90R40C
DMA controller, Interrupt handler and Serial Pe-
ripheral Interface as standard features
40 fully programmable I/O pins
Up to 8 external plus 1 non-maskableinterrupts
16 bit Timer with 8 bit Prescaler, able to be used
as a WatchdogTimer
Two 16 bit Multifunction Timers, each with an 8
bit prescaler and 13 operating modes
8 channel 8 bit Analog to Digital Converter, with
Analog Watchdogs and external references
Serial Communications Interface with asynchro-
nous and synchronous capability
Rich Instruction Set and 14 Addressingmodes
Division-by-Zero trap generation
Versatile developmenttools, including assembler,
linker, C-compiler, archiver, graphic orinted de-
buggerand hardware emulators
Real Time Operating System
Compatible with ST9040 16K ROM device (also
availablein windowedand One Time Programma-
ble EPROM packages)

March 1994 49/56

ST90R40

Figure 1. 68 Pin PLCC Package

Table 1. ST90R40C Pin Description

Pin Name Pin Name Pin Name Pin Name
61 P44/Ain4 10 P35/T1OUTA 43 P70/SIN 60 AVSS
62 P57 11 P34/T1INA 42 P71/SOUT 59 AVDD
63 P56 12 P33/T0OUTB P72/CLKOUT 58 P47/Ain7
41
64 P55 13 P32/T0INB /TXCLK/INT4 57 P46/Ain6
65 P54 14 P31/T0OUTA P73/ADTRG 56 P45/Ain5
40
66 INT7 15 P30/P/D/T0INA /RXCLK/INT5 55 P43/Ain3
67 INT0 16 A15 39 P74/P/D/INT6 54 P42/Ain2
68 P53 17 A14 38 P75/WAIT 53 P41/Ain1
1 P52 18 A13 P76/WDOUT 52 P40/Ain0
37
2 P51 19 A12 /BUSREQ 51 P27/RRDY5
3 P50 20 A11 P77/WDIN P26/INT3
36 50
4 OSCOUT 21 A10 /BUSACK /RDSTB5/P/D
5 VSS 22 A9 35 R/W 49 P25/WRRDY5
6 OSCIN 23 A8 34 DS P24/INT1
48
7 RESET 24 A0/D0 33 AS /WRSTB5
8 P37/T1OUTB 25 A1/D1 32 VDD 47 P23/SDO
9 P36/T1INB 26 A2/D2 31 A7/D7 46 P22/INT2/SCK
30 A6/D6 45 P21/SDI/P/D
29 A5/D5 44 P20/NMI
28 A4/D4
27 A3/D3

50/56

 ST90R40

1.1 GENERAL DESCRIPTION

The ST90R40 is a ROMLESS member of the ST9 8 bit I/O ports. The Core has independentmemory
family of microcontrollers, completely developed and register buses allowing a high degree of pipe-
and produced by SGS-THOMSON Microelectron- lining to add to the efficiency of the code execution
ics using a proprietary n-well HCMOS process. speed of the extensive instruction set.
The ROMLESS part may be used for the prototyp- The powerful I/O capabilities demanded by micro-
ing and pre-production phases of development, controller applications are fulfilled by the ST90R40
and offers the maximum in program flexibility in with up to 56 I/O lines dedicated to memory ad-
production systems. dressing or digital Input/Output. These lines are
The ST90R40 is fully compatible with the ST9040 grouped into up to seven 8 bit I/O Ports and can be
ROM version and this datasheet will thus provide configured on a bit basis under software control to
only information specific to the ROMLESS device. provide timing and status signals, address lines,
timer inputs and outputs, analog inputs, external
THE READER IS ASKED TO REFER TO THE interrupts and serial or parallel I/O with or without
DATASHEET OF THE ST9040 ROM-BASED DE- handshake.
VICE.
Three memory spaces are available: Program Mem-
The ROMLESS ST90R40 can be configured as a ory (external), Data Memory (internal and external)
microcontroller able to manage external memory, and the Register File, which includes the control and
or as a parallel processing element in a system statusregisters of the on-chip peripherals.
with other processors and peripheral controllers.
Two 16 bit MultiFunction Timers, each with an 8 bit
The nucleus of the ST90R40 is the advancedCore Prescaler and 13 operating modes allow simple
which includes the Central Processing Unit (CPU), use for complex waveform generation and meas-
the Register File, a 16 bit Timer/Watchdog with 8 urement, PWM functions and many other system
bit Prescaler, a Serial Peripheral Interface support- timing functionsby the usage of the two associated
ing S-BUS, I2C-bus and IM-bus Interface, plus two DMA channels for each timer.

Figure 2. Block Diagram

INT0 INT7
8

1 6-Bit TIMER / WATCHDOG + SPI

512 Bytes 256 Bytes 256 Bytes SCI I/O PORT 7
( SCI )
EEPROM RAM REGISTER FILE
CPU WITH DMA

MEMORY BUS

REGISTER BUS

I/O PORT 0 I/O PORT 1 I/O PORT 2 I/O PORT 3 2 x 16-bit TIMER I/O PORT 4 A /D I/O PORT 5
( Address/Data ) ( Address ) ( SPI ) ( TIMERS ) W ITH DM A ( Ana log Inpu ts ) CONVERTER WITH HANDSHAKE

8 8 8 8 8 8
AVD D AVS S

VR0B1385

51/56

ST90R40

GENERAL DESCRIPTION (Continued)

In addition there is an 8 channel Analog to Digital Completing the device is a full duplex Serial Com-
Converter with integral sample and hold, fast 11s munications Interface with an integral 110 to
conversion time and 8 bit resolution. An Analog 375000 baud rate generator, asynchronous and
Watchdog feature is included for two input chan- 1.5Mbyte/s synchronous capability (fully program-
nels. mable format) and associated address/wake-up
option, plus two DMA channels.

1.2 PIN DESCRIPTION OSCIN, OSCOUT. Oscillator (input and output).

These pins connect a parallel-resonant crystal
AS. Address Strobe (output, active low, 3-state). (24MHz maximum), or an external source to the
Address Strobe is pulsed low once at the begin- on-chip clock oscillator and buffer. OSCIN is the in-
ning of each memory cycle. The rising edge of AS put of the oscillator inverter and internal clock gen-
indicates that address, Read/Write (R/W), and erator; OSCOUT is the output of the oscillator
Data Memory signals are valid for program or data inverter.
memory transfers. Under program control, AS can
be placed in a high-impedance state along with AVDD. Analog V DD of the Analog to Digital Con-
Port 0 and Port 1, Data Strobe (DS) and R/W. verter.
DS. Data Strobe (output, active low, 3-state). Data AVSS. Analog VSS of the Analog to Digital Con-
Strobe provides the timing for data movement to or verter. Must be tied to VSS.
from Port 0 for each memory transfer. During a VDD. Main Power Supply Voltage (5V10%)
write cycle, data out is valid at the leading edge of VSS. Digital Circuit Ground.
DS. During a read cycle, Data In must be valid prior
to the trailing edge of DS. When the ST90R40 ac- AD0-AD7, (P0.0-P0.7) Address/Data Lines (In-
cesses on-chip Data memory, DS is held high dur- put/Output, TTL or CMOS compatible). 8 lines pro-
ing the whole memory cycle. It can be placed in a viding a multiplexed address and data bus, under
high impedance state along with Port 0, Port 1, AS control of the AS and DS timing signals.
and R/W. A8-A15 Address Lines (Output, TTL or CMOS
R/W. Read/Write (output, 3-state). Read/Write de- compatible). 8 lines providing non-multiplexing ad-
termines the direction of data transfer for memory dress bus, under control of the AS and DS timing
transactions. R/W is low when writing to program signals.
or data memory, and high for all other transactions. P2.0-P2.7 P3.0-P3.7, P4.0-P4.7, P5.0-P5.7, P7.0-
It can be placed in a high impedance state along P7.7 I/O Port Lines (Input/Output, TTL or CMOS
with Port 0, Port 1, AS and DS. compatible). 40 lines grouped into I/O ports of 8
RESET. Reset (input, active low). The ST9 is ini- bits, bit programmable under program control as
tialised by the Reset signal. With the deactivation general purpose I/O or as Alternate functions (see
of RESET, program executionbegins from the Pro- next section).
gram memory location pointed to by the vector
contained in program memory locations 00h and 1.2.1 I/O PORT ALTERNATE FUNCTIONS
01h.
Each pin of the I/O ports of the ST90R40 may as-
sume software programmable Alternative Func-
tions as shown in the Pin Configuration Drawings.
Table 2 shows the Functions allocated to each I/O
Port pins.

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 ST90R40

PIN DESCRIPTION (Continued)

Table 2. I/O Port Alternate Function Summary
I/O PORT Function
Name Alternate Function
Port.bit IN/OUT

P0.0 A0/D0 I/O Address/Data bit 0 mux 24

P0.1 A1/D1 I/O Address/Data bit 1 mux 25
P0.2 A2/D2 I/O Address/Data bit 2 mux 26
P0.3 A3/D3 I/O Address/Data bit 3 mux 27
P0.4 A4/D4 I/O Address/Data bit 4 mux 28
P0.5 A5/D5 I/O Address/Data bit 5 mux 29
P0.6 A6/D6 I/O Address/Data bit 6 mux 30
P0.7 A7/D7 I/O Address/Data bit 7 mux 31
P1.0 A8 O Address bit 8 23
P1.1 A9 O Address bit 9 22
P1.2 A10 O Address bit 10 21
P1.3 A11 O Address bit 11 20
P1.4 A12 O Address bit 12 19
P1.5 A13 O Address bit 13 18
P1.6 A14 O Address bit 14 17
P1.7 A15 O Address bit 15 16
P2.0 NMI I Non-Maskable Interrupt 44
P2.1 P/D O Program/Data Space Select 45
P2.1 SDI I SPI Serial Data Out 45
P2.2 INT2 I External Interrupt 2 46
P2.2 SCK O SPI Serial Clock 46
P2.3 SDO O SPI Serial Data In 47
P2.4 INT1 I External Interrupt 1 48
P2.4 WRSTB5 O Handshake Write Strobe P5 48
P2.5 WRRDY5 I Handshake Write Ready P5 49
P2.6 INT3 I External Interrupt 3 50
P2.6 RDSTB5 I Handshake Read Strobe P5 50
P2.6 P/D O Program/Data Space Select 50
P2.7 RDRDY5 O Handshake Read Ready P5 51
P3.0 T0INA I MF Timer 0 Input A 15
P3.0 P/D O Program/Data Space Select 15
P3.1 T0OUTA O MF Timer 0 Output A 14
P3.2 T0INB I MF Timer 0 Input B 13
P3.3 T0OUTB O MF Timer 0 Output B 12
P3.4 T1INA I MF Timer 1 Input A 11

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ST90R40

PIN DESCRIPTION (Continued)

Table 2. I/O Port Alternate Function Summary (Continued)
I/O PORT Function
Name Alternate Function
Port.bit IN/OUT

P3.5 T1OUTA O MF Timer 1 Output A 10

P3.6 T1INB I MF Timer 1 Input B 9
P3.7 T1OUTB O MF Timer 1 Output B 8
P4.0 Ain0 I A/D Analog Input 0 52
P4.1 Ain1 I A/D Analog Input 1 53
P4.2 Ain2 I A/D Analog Input 2 54
P4.3 Ain3 I A/D Analog Input 3 55
P4.4 Ain4 I A/D Analog Input 4 61
P4.5 Ain5 I A/D Analog Input 5 56
P4.6 Ain6 I A/D Analog Input 6 57
P4.7 Ain7 I A/D Analog Input 7 58
P5.0 I/O I/O Handshake Port 5 3
P5.1 I/O I/O Handshake Port 5 2
P5.2 I/O I/O Handshake Port 5 1
P5.3 I/O I/O Handshake Port 5 68
P5.4 I/O I/O Handshake Port 5 65
P5.5 I/O I/O Handshake Port 5 64
P5.6 I/O I/O Handshake Port 5 63
P5.7 I/O I/O Handshake Port 5 62
P7.0 SIN I SCI Serial Input 43
P7.1 SOUT O SCI Serial Output 42
P7.2 INT4 I External Interrupt 4 41
P7.2 TXCLK I SCI Transmit Clock Input 41
P7.2 CLKOUT O SCI Byte Sync Clock Output 41
P7.3 INT5 I External Interrupt 5 40
P7.3 RXCLK I SCI Receive Clock Input 40
P7.3 ADTRG I A/D Conversion Trigger 40
P7.4 INT6 I External Interrupt 6 39
P7.4 P/D O Program/Data Space Select 39
P7.5 WAIT I External Wait Input 38
P7.6 WDOUT O T/WD Output 37
P7.6 BUSREQ I External Bus Request 37
P7.7 WDIN I T/WD Input 36
P7.7 BUSACK O External Bus Acknowledge 36

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 ST90R40

1.3 MEMORY
The memory of the ST90R40 is functionallydivided on-chip RAM memory at addresses 200h through
into two areas, the Register File and Memory. The 2FFh.
Memorymay optionallybe divided into two spaces, The External Memory spaces are addressedusing
each having a maximum of 65,536 bytes. The two the multiplexed address and data buses on Ports 0
memory spaces are separated by function, one and 1. Data Memory may be decodedexternally by
space for Program code, the other for Data. The using the P/D Alternate Function output. The on-
ST90R40 addresses all program memory in the chip general purpose (GP) Registers may be used
external PROGRAM space. The DATA space in- as RAM memory.
cludes the 512 bytes of on-chip EEPROM at ad-
dresses 0 through 1FFh and the 256 bytes of

Figure 3. Memory Spaces

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ST90R40

ORDERING INFORMATION
Sales Type Frequency Temperature Range Package
ST90R40C6 24MHz -40C to + 85C PLCC68

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-
THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without the express
written approval of SGS-THOMSON Microelectronics.

1997 SGS-THOMSON Microelectronics - All rights reserved.

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Purchase of I C Components by SGS-THOMSON Microelectronics conveys a license under the Philips I C Patent.
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Rights to use these components in an I C system is granted provided that the system conforms to the I C Standard
Specification as defined by Philips.
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