PIC16F87X

PIC16F87X Rev. B Silicon Errata Sheet

The PIC16F87X (Rev. B) parts you have received con- 1. Module: Program Memory
form functionally to the Device Data Sheet When instruction execution resumes after an inter-
(DS30292A), except for the anomalies described nal program cycle terminates, the following 16
below. memory locations must be blank (all 1’s). Other-
All the problems listed here will be addressed in future wise this may cause unexpected device operation.
revisions of the PIC16F87X silicon. Work Around
All devices have been marked revision “B” and “engi- To address this issue, use the following software
neering sample” or “ES”. sequence. Fixed in silicon revision B3.

EXAMPLE 1: CODE WORK AROUND

bsf STATUS, RP1
bcf STATUS, RP0
.
.
.
bcf INTCON, GIE ; If interrupts enabled
movlw 0x55
movwf EECON2
movlw 0xAA
movwf EECON2
bsf EECON1, WR
nop
;
; When used with MPASM, the data 0x3fff places all ’1’s at that point in the program.
; This executes as an addlw 0xff instruction which is completely benign at this point
; in the program.
;
data 0x3fff ; Instruction with all ones
data 0x3fff ; needed to clear high voltage
data 0x3fff ; out of the program memory
data 0x3fff ; arrays
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
data 0x3fff
bsf INTCON, GIE ; If interrupts enabled
bcf EECON1, WREN

 1999 Microchip Technology Inc. DS80053B-page 1

PIC16F87X
2. Module: MSSP - SPI mode The scenarios which display this are:
The SDI pin is controlled by the module and not by a) When a read operation of the TMR1H regis-
the state of the TRIS bit. This means that the SDI ter occurs, the TMR1L register may not
pin cannot be an output when the MSSP module is increment.
in SPI mode. b) When a read operation of the TMR1L regis-
Work Around ter occurs, the TMR1H register may not
increment. This improper operation is only
None for current silicon revision
an issue when the TMR1L register incre-
(fixed in silicon revision B4)
ments from FFh to 00h (FFh → 00H) during
3. Module: Electrical Specifications the read of the TMR1L register.
The Supply Voltage specification has not yet met Work Around
the design target (Data Sheet specification). The
Do not read either the TMR1H or the TMR1L reg-
specification for these devices is shown in Table 1.
isters when operating in external clock mode
4. Module: A/D Specifications (TMR1CS is set). If the application needs to read
The Offset Error specification has not yet met the the 16-bit counter, evaluate if this function can be
design target (Data Sheet specification). The moved to the TMR0 or one of the other timer
specification for these devices is shown in Table 1. resources on the device.

5. Module: TMR1
When operating in external clock mode (TMR1CS
is set), reading either of the timer 1 registers
(TMR1H or TMR1L) may cause the timer not to
increment as expected. This occurs for both syn-
chronous and asynchronous inputs.

TABLE 1: DC SPECIFICATION CHANGES FROM DATA SHEET

Data Sheet
Tested Specification
Param Specification
Sym. Characteristic Units
No.
Min Typ Max Min Typ Max

D001 VDD Supply Voltage 2.5 — 5.5 2.0 — 5.5 V

A06 EOFF Offset Error — — <±2 — — <±1 LSb

DS80053B-page 2  1999 Microchip Technology Inc.

 PIC16F87X
6. Module: I/O Ports Clarifications/Corrections to the Data Sheet:
The IOL condition for the VOL specification has In the Device Data Sheet (DS30292A), the following
been relaxed for the I/O ports. Table 2 shows what clarifications and corrections should be noted:
the current data sheet specification is, as well as
None.
the limit that the device is currently tested to.
Work Around
None
TABLE 2: DC SPECIFICATION CHANGES FROM DATA SHEET

Tested Specification Data Sheet Specification

Param
Sym. Characteristic Units
No.
Min Typ Max Condition Min Typ Max Condition

D080 VOL Output Low — — 0.6 IOL = 3.0 mA — — 0.6 IOL = 8.5 mA V
Voltage VDD = 4.5 V VDD = 4.5 V
I/O ports -40°C -to 85°C -40°C -to 85°C

D080A — — 0.6 IOL = TBD mA — — 0.6 IOL = 7.0 mA V

VDD = 4.5 V VDD = 4.5 V
-40°C -to 125°C -40°C -to 125°C

 1999 Microchip Technology Inc. DS80053B-page 3

Note the following details of the code protection feature on PICmicro® MCUs.

• The PICmicro family meets the specifications contained in the Microchip Data Sheet.
• Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today,
when used in the intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowl-
edge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet.
The person doing so may be engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable”.
• Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of
our product.
If you have any further questions about this matter, please contact the local sales office nearest to you.

Information contained in this publication regarding device Trademarks

applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to The Microchip name and logo, the Microchip logo, FilterLab,
ensure that your application meets with your specifications. KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
No representation or warranty is given and no liability is PICSTART, PRO MATE, SEEVAL and The Embedded Control
assumed by Microchip Technology Incorporated with respect Solutions Company are registered trademarks of Microchip Tech-
to the accuracy or use of such information, or infringement of nology Incorporated in the U.S.A. and other countries.
patents or other intellectual property rights arising from such
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
use or otherwise. Use of Microchip’s products as critical com-
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
ponents in life support systems is not authorized except with
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
express written approval by Microchip. No licenses are con-
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
veyed, implicitly or otherwise, under any intellectual property
and Total Endurance are trademarks of Microchip Technology
rights.
Incorporated in the U.S.A.

Serialized Quick Turn Programming (SQTP) is a service mark

of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

© 2002, Microchip Technology Incorporated, Printed in the

U.S.A., All Rights Reserved.

Printed on recycled paper.

Microchip received QS-9000 quality system

certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999. The
Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs and microperipheral
products. In addition, Microchip’s quality
system for the design and manufacture of
development systems is ISO 9001 certified.

 2002 Microchip Technology Inc.

M
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01/18/02

 2002 Microchip Technology Inc.