INDIAN INSTITUTE OF INFORMATION
TECHNOLOGY BHAGALPUR-813210
SUBMITTED BY: SHEELAJ BABU
ROLL NO:180101041(CSE)
SEMESTER:IV
Department Of Electronics & Communication Engineering
IIIT Bhagalpur,Bihar-813210,INDIA
MICROPROCESSOR &
JAN-MAY-2020
INTERFACINGS LAB
REPORT
INDIAN INSTITUTE OF INFORMATION TECHNOLOGY [IIIT]
Bhagalpur-813210, Bihar, INDIA
DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING
ss ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
CERTIFICATE
This is to certify that Mr. SHEELAJ BABU bearing Institute Roll No.
180101041 has satisfactorily completed the course in Microprocessor &
interfacings (EC216) during the academic year 2020-2021.
DATE :22/05/2020
PLACE:IIIT,BHAGALPUR
Dr. Suraj
Assistant Professor,(ECE)
IIIT, Bhagalpur-813210
contents:-
2
EXPERIMENT- 01
Toggle LEDs connected at Port P1. 9
1.1 AIM : 9
1.2 Program : 9
1.3 Hex Code: 9
1.4 Simulated Output: 10
1.5 Conclusion 10
EXPERIMENT- 02
Toggle LEDs connected to the port P1, from right to left, keeping previous LEDs off. 11
2.1 AIM : 11
2.2 Program : 11
2.3 Hex Code: 12
2.4 Simulated Output: 12
2.5 Conclusion 12
EXPERIMENT- 03
Toggle LEDs connected to the port P1, from left to right, keeping previous LEDs on. 13
3
3.1 AIM : 13
3.2 Program : 13
3.3 Hex Code 9
3.4 Simulated Output: 9
3.5 Hardware interfaced output: 10
3.6 Conclusion 10
EXPERIMENT- 04
Toggle LED with delay of 500 ms connected at port P1.1: Use of Software delay 10
4.1 AIM : 10
4.2 Program : 10
4.3 Hex Code 11
4.4 Simulated Output: 11
4.5 Conclusion 12
EXPERIMENT- 05
Hardware delay using timer 0 in mode 1 18
4
5.1 AIM : 18
5.2 Program : 18
5.3 Hex Code 18
5.4 Simulated Output: 19
5.5 Conclusion 19
EXPERIMENT- 06
Hardware delay using timer 0 in mode 2 20
6.1 AIM : 20
6.2 Program 20
6.3 Hex Code 20
6.4 Simulated Output: 21
6.5 Conclusion 21
EXPERIMENT- 07
Hardware delay using interrupt (use auto-reload mode) 22
7.1 AIM : 22
5
7.2 Program 22
7.3 Hex Code 23
7.4 Simulated Output: 23
7.5 Hardware interfaced output: 23
7.6 Conclusion 24
EXPERIMENT- 08
Generation of PWM wave of specified frequency and duty cycle 25
8.1 AIM : 25
8.2 Program 25
8.3 Hex Code 26
8.4 Simulated Output: 26
8.6 Conclusion 26
EXPERIMENT- 09
Display 0 to 9 using seven segment display 15
6
9.1 AIM : 15
9.2 Program 15
9.3 Hex Code 15
9.4 Simulated Output: 16
9.5 Hardware interfaced output: 16
9.6 Conclusion 17
EXPERIMENT- 10
Design of digital voltmeter: Application of ADC 15
10.1 AIM : 15
10.2Program 15
10.3 Hex Code 15
10.4 Simulated Output: 19
10.5 Hardware interfaced output: 16
10.6 Conclusion 17
EXPERIMENT- 11
Interfacing of servo motor 15
7
11.1 AIM : 15
11.2Program 15
11.3 Hex Code 15
11.4 Simulated Output: 19
11.5 Hardware interfaced output: 16
11.6 Conclusion 17
-:Toggle LEDs connected at Port P1:-
8
1.1 AIM :
Toggle the LEDs connected at alternate pin of the port P1.
1.2 PROGRAM:
// Header:-Simple on-off blinking
// Author:SHEELAJ BABU
// Date:17-jan-2020
#include <reg51.h>// including register header file
void main()
unsignedint index;// defining running variable
while(1)// super loop
P0=0x55;// initializing register
for(index=0;index<10000;index++);// delay
P0=0xAA;// shifted register value
for(index=0;index<10000;index++);// delay
1.3 HEX CODE:
:03000000020827CC
:0C082700787FE4F6D8FD75810702080018
:10080000758055E4FFFE0FBF00010EBE27F8BF1034
:10081000F57580AAE4FEFFC3EF9410EE942750E034
:070820000FBF00010E80F084
:00000001FF
9
1.4 SIMULATED OUTPUT:
1.5 CONCLUSION:
Thus We Have got Simple on off blinking is implemented using (01010101) 2=(55)16
and (10101010)2=(AA)16 .
-:Toggle LEDs connected to the port P1, from right to left,
10
keeping previous LEDs off :-
2.1 AIM :
Right to left blink shifting with the use of shifting operator and previous LEDs off.
2.2 PROGRAM :
// Header: Right to left blink shifting
// Author: SHEELAJ BABU
// Date: 03-Feb-2020
#include <reg51.h>
void delay()//Function for creating Delay.
unsignedint index1,index2;//Declaring Variables.
for( index1=0;index1<200;index1++)// Nested loop for Creating Delsy
for(index2=0;index2<10000;index2++);
void main()
unsignedint index;//Declaring running Variable
while(1)//Infinite while Loo1
P1=0x01;
for(index=0;index<7;index++)//Repeating the loop 7 times for each Led.
delay();//Calling Delay
P1=P1<<1;//Shifting the Value one bit to left.
delay();//Calling Delay
2.3 HEX CODE:
11
:0300000002083CB7
:0C083C00787FE4F6D8FD75810702080003
:10081F00E4FFFEE4FDFC0DBD00010CBC27F8BD108C
:0C082F00F50FBF00010EEF64C84E70E72B
:01083B00229A
:10080000759001E4FBFA12081FE59025E0F59012BF
:0F081000081F0BBB00010AEB64074A70E980E187
:00000001FF
2.4 SIMULATED OUTPUT:
2.5 CONCLUSION:
So in this experiment we have to (Right to left) blink shifting is implemented.The idea of using for loop is
clearly now .
12
-: Toggle LEDs connected to the port P1, from left to right,
keeping previous LEDs on.:-
3.1 AIM:
left to right blink shifting with the use of shifting operator and previous LEDs on.
3.2 PROGRAM:
// Header: Left to Right blink shifting with previous led on
// Author: SHEELAJ BABU
// Date: 10-Feb-2020
#include <reg51.h>
void delay()//Function for creating Delay.
unsignedint index1,index2;//Declaring Variables.
for( index1=0;index1<200;index1++)// Nested loop for Creating Delsy
for(index2=0;index2<10000;index2++);
void main()
unsignedint index;//Declaring running Variable
while(1)//Infinite while Loo1
P1=0x80;
for(index=0;index<7;index++)//Repeating the loop 7 times for each Led.
delay();//Calling Delay
P1=(P1>>1)+0x80;//Shifting the Value one bit to right keeping previous led on.
delay();//Calling Delay
13
3.3 HEX CODE:
:0300000002083EB5
:0C083E00787FE4F6D8FD75810702080001
:10082100E4FFFEE4FDFC0DBD00010CBC27F8BD108A
:0C083100F50FBF00010EEF64C84E70E729
:01083D002298
:10080000759080E4FBFA120821E590C3132480F56B
:10081000901208210BBB00010AEB64074A70E780C5
:01082000DFF8
:00000001FF
3.4 SIMULATED OUTPUT:
14
3.5 HARDWARE INTERFACED OUTPUT:
3.6 CONCLUSION:
In this experiment we have implemented Left to Right blink shifting with previous led
on.
15
-:Toggle LED with delay of 500 ms connected at
port P1.1: Use of Software delay:-
4.1 AIM:
Toggle LED with delay of 500ms connected at p1.1:-using software delay.
4.2 PROGRAM :
// Header: Specified delay by software
// Author: SHEELAJ BABU
// Date: 03-Feb-2020
#include <reg51.h>// including register header file
void main()
unsignedint index;// defining running variable
while(1)// super loop
P1=0x02;// Setting p1.1
for(index=0;index<3000;index++);// delay
P1=0x00;// negates p1.1 value(reset p1.1)
for(index=0;index<1500;index++);// delay
4.3 HEX CODE:
:03000000020828CB
:0C082800787FE4F6D8FD75810702080017
:10080000759002E4FFFE0FBF00010EE4B507F7EE9E
:10081000B47DF3E4F590FEFFC3EF9480EE943E5078
:08082000DF0FBF00010E80F0A4
:00000001FF
16
4.4 SIMULATED OUTPUT:
Wave Made BY 500ms Delay:-
4.5 CONCLUSION:
Port output confirms that led is toggling . Further delay is measured which is 500ms. So
required condition is successfully completed.
-: Hardware delay using timer 0 in mode-1:-
17
5.1 AIM :
To generate square wave using delay of timer 0 in mode 1
5.2 ASSEMBLY PROGRAM :
// Header: Hardware delay delay using timer 0 mode 1
// Author:SHEELAJ BABU
// Date: 1-May-2020
//org0h
MOV TMOD,#01H; Configuring TMOD register to timer 0 in mod 1
myLabel:MOV TH0,#87H; Setting TH0
MOV TL0,#0CEH; Setting TL0
ACALL Suraj; Calling Delay subroutine
SJMP myLabel; Short jump on to location mylabel
Suraj:
SETB TR0 ; Starting Timer tick
here:JNB TF0,here ; Jump on not bit
CPL P1.1 ; Complement P1.1
CLR TF0 ; Reset TF0
CLR TR0 ; Reset TR0
RET; Return
END;End of Program
5.3 HEX CODE:
:10000000758901758C87758ACE110D80F6D28C307A
:090010008DFDB291C28DC28C225B
:00000001FF
5.4 SIMULATED OUTPUT:
18
5.5 CONCLUSION:-
In This experiment the Square wave is generated with 50% duty cycle using delay of timer 0
in mod 1.
-: Hardware delay using timer 0 in mode 2:-
19
6.1 AIM :
To generate square wave using delay of timer 0 in mode 2.
6.2 ASSEMBLY PROGRAM:
// Header: Hardware delay using timer 0 mode 2
// Author:SHEELAJ BABU
// Date: 01-May-2020
MOV TMOD,#02H;set timer 0 in mod 2
AGAIN:MOV TH0,#0FFH;loads count value
SETB TR0;starts timer 0
BACK:JNB TF0,BACK//check for over flow
CLR TR0
CPL P2.3;negates port value
CLR TF0
SJMP AGAIN
END
6.3 HEX CODE:
:10000000758902758CFFD28C308DFDC28CB2A3C273
:030010008D80F0F0
:00000001FF
6.4 SIMULATED OUTPUT:
20
Port output to check square bit is fluctuating or not for the confirmation of production of
square wave.
Timer out to check wether timer 0 in auto reload mode is set up or not.
HERE > Square wave with 50% duty cycle:—
6.5 CONCLUSION:-
Finally the Square wave is successfully generated with 50% duty cycle using delay of timer 0
in mod 2.
-: Hardware delay using interrupt (use auto-reload
21
mode):-
7.1 AIM :
Write an ALP that continuously read 8 bit data from Port 2 and send the data to Port 0.At the same time it
should generate square wave 0f 500 micro seconds period on pin P1.0.Assume crystal frequency is 11.0592
MHz.
Interrupt Vector Location
--------------------------------------------------------------------------
~INT0 0003H
TF0 000BH
INT1 0013H
7.2 ASSEMBLY PROGRAM:
// Header: Hardware delay using timer 1 mode 2
// Author:SHEELAJ BABU
// Date: 01-May-2020
ORG0000H
MOV P1,#00H;makes all bits of port 1, 0
LJMP MAIN ;jump to main lable
ORG001BH; ISR for timer 1 interrupt
CPL P1.0 ;Complement P1.0 bit
CLR TF1 ; Clear TF1
RETI ;Return from ISR
;//ORG 0040H;Start main program after interrupt vector table
MAIN:MOV TMOD,#20H;Timer 1 in mode 2
MOV P2,#0FFH;Configure Port 2 as input
MOV TH1,#1AH;Calculated as per the question
;//MOV IE,#88H;Enable timer 1 interrupt
MOV IE,#88H;enables ET1 and EA
SETB TR1 ;Start timer 1
BACK:MOV A,P2;Read data from P2
MOV P0,A;Send data on P0
SJMP BACK ;Repeat
END
22
7.3 HEX CODE:
:06000000759000020020D3
:10001B00B290C28F3275892075A0FF758D1A75A8A5
:09002B0088D28EE5A0F58080FA70
:00000001FF
7.4 SIMULATED OUTPUT:
Port output to check square bit is fluctuating or not for the conformation of production of square wave.
Port 2 and port 0 data:
Timer output:
23
Interupt peripheral output:
Square wave with a specified time period of 500ms.
7.5 CONCLUSION:-
In this experiment the Square wave of specified time period 500 micro sec is generated with
50% duty cycle using timer 1 in auto reload mode.Also port 2 ad 0 data are same which
confirms that data from port2 is read and sended to port 0 succesfully.
Timer peripherals further confirms that timer 1 is used in auto reload mode(mode
2).Interupt peripheral shows that interrupt is enabled.
24
-:Generation of PWM wave of specified frequency and duty
cycle:-
8.1 AIM :Generate a PWM Wave of 14.68Hz and 70% duty cycle at P1.1 .
8.2 PROGRAM:
// Header: Pwm wave with specified duty cycle and frequency.
// Author: SHEELAJ BABU
// Date: 06-May-2020
# include <reg51.h>
int index=0;
sbit x =P1^1;
void main()
TMOD =0x01;//sets timer 0 in mode 1
IE=0x82;// globally enables the interupts and makes ET0=1
TL0=0xE1;//loads timer value to get desired delay
TH0=0X0A;//loads timer value to get desired delay
TR0=1;//makes timer 0 on
x=1;//sets x
while(1)//infinite loop
if(index==70)//condition for on period
x=0;
if(index ==100)// condition for off period
x=1;
index=0;
Void isr(void) interrupt 1// interupt service routine
index++;//increments x
25
}
8.3 HEX CODE:
:03000000020800F3
:0C080000787FE4F6D8FD758109020847F6
:0408C3000208000027
:10088C0075890275A882758AE1758C0AD28CD29111
:10089C00E509644645087002C291E509646445089F
:0A08AC0070EED291F508F50980E620
:03000B000208B632
:0D08B600C0E00509E50970020508D0E03238
:10080C0002088CE493A3F8E493A34003F68001F26E
:10081C0008DFF48029E493A3F85407240CC8C333ED
:10082C00C4540F4420C8834004F456800146F6DFBC
:10083C00E4800B01020408102040809008C3E47E81
:10084C00019360BCA3FF543F30E509541FFEE493B1
:10085C00A360010ECF54C025E060A840B8E493A378
:10086C00FAE493A3F8E493A3C8C582C8CAC583CAA3
:10087C00F0A3C8C582C8CAC583CADFE9DEE780BE5B
:0108C7000030
:00000001FF
8.4 SIMULATED OUTPUT:
Below the PWM wave:
8.5 CONCLUSION:
In this experiment we have ,Pwm wave is successfully generated with 14.68Hz frequency and
70% duty cycle. Further fluctuating port1.1 output confirms the generation of pwm wave.
26
-: Display 0 to 9 using seven segment display:-
9.1 AIM :
Program to display 0 to 9 using seven segment display .
9.2 PROGRAM:
//AUTHOR-SHEELAJ BABU
//ROLL-180101041
//BRANCH-CSE
#include<reg51.h>
sbit x=P2^7;
sbit y=P2^6;
sbit z=P2^5;
void delay(void);
unsigned int i,j,seg=0;
void main()
{
unsigned char
disp[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
while(1)
{
k:
if(seg==0)
{
x=0;
y=0;
z=0;
}
if(seg==1)
{
x=0;
y=0;
z=1;
}
if(seg==2)
{
x=0;
y=1;
z=0;
}
if(seg==3)
{
x=0;
y=1;
z=1;
}
if(seg==4)
{
seg=0;
27
goto k;
}
for(i=0;i<10;i++)
{
P0=disp[i];
for(j=0;j<1000;j++)
{delay();}
}
seg++;
}
}
void delay(void)
{
TMOD=0x01;
TL0=0xFB;
TH0=0xF3;
TR0=1;
while(TF0==0);
TF0=0;
TR0=0;
}
28
9.3 HEX CODE:
:0308AE000108003E
:10088C0075890275A882758CE1D28CAF087E00EF59
:10089C0064467002C291EF64644E70EFD291F50819
:0208AC0080E9E1
:03000B000208B236
:0308B20005083204
:03000000020800F3
:0C080000787FE4F6D8FD758108020847F7
:10080C0002088CE493A3F8E493A34003F68001F26E
:10081C0008DFF48029E493A3F85407240CC8C333ED
:10082C00C4540F4420C8834004F456800146F6DFBC
:10083C00E4800B01020408102040809008AEE47E96
:10084C00019360BCA3FF543F30E509541FFEE493B1
:10085C00A360010ECF54C025E060A840B8E493A378
:10086C00FAE493A3F8E493A3C8C582C8CAC583CAA3
:10087C00F0A3C8C582C8CAC583CADFE9DEE780BE5B
:0108B1000046
:00000001FF
9.4 HARDWARE INTERFACED OUTPUT:
9.5 CONCLUSION:-
We used four 7 segment LED displays to continuously display series of
numbers from 0 to 9. We kept shifting this series from first segment to
last segment.
29
-:Design of digital voltmeter: Application of ADC:-
10.1 AIM :
Write a program to design of ADC.
10.2 PROGRAM:
// Header: Digital voltmeter.
// Author: SHEELAJ BABU
// Date: 06-May-2020
#include <reg51.h>
#include <intrins.h>
#define display_port P0
sbit ALE=P3^1;
sbit EOC=P3^2;
sbit OE=P3^3;
sbit SOC=P3^4;
sbit CS_A=P3^5;
sbit CS_B=P3^6;
sbit CS_C=P3^7;
unsignedinta,b,c,d,e,f,g,h,i,j,k,V[5];
void ADC_INI(void);
void ADC_READ(void);//function to read data
void calculate(unsignedint u);
sbit RS=P2^7;
sbit RW=P2^6;
sbit EN=P2^5;
void DISP_LCD(void);//function to display data on lcd
voidlcd_ini(void);
voidlcd_cmd(unsignedchar command);
voidlcd_data(unsignedchardispdata);
void delay (unsignedint t);
void main()
30
ADC_INI();
while(1)
ADC_INI();
ADC_READ();
void ADC_INI()
P1=0xFF;
ALE=0;
SOC=0;
OE=0;
EOC=1;
delay(1);
//return;
void ADC_READ()//function to read data
CS_A=0;
CS_B=0;
CS_C=0;
ALE=1;
delay(1);//to produce delay
SOC=1;
delay(1);//to produce delay
ALE=0;
delay(1);//to produce delay
SOC=0;
delay(1);
while(EOC==1);
delay(1);//to produce delay
OE=1;
delay(1);//to produce delay
a=P1;
delay(1);//to produce delay
OE=0;
calculate(a);
//return;
31
}
void calculate(unsignedint u)
h=2500/255;
b=u*h;
V[0]=b/1000+0x30;
c=b%1000;
V[2]=c/100+0x30;
d=e%100;
V[3]=e/10+0x30;
f=e%10;
V[4]=f+0x30;
DISP_LCD();
//return;
void DISP_LCD()//function to display data on lcd
unsignedchar z[7]="VOLTAGE";// first line to be printed on lcd
lcd_ini();
lcd_cmd(0x80);
for(i=0;i<7;i++)
lcd_data(z[i]);
delay(500);
lcd_cmd(0xC0);
for(i=0;i<5;i++)
if(i==1)
lcd_data('.');
else
lcd_data(V[i]);
delay(500);
//return;
32
}
voidlcd_cmd(unsignedchar command)
P0=command;
RS=0;
RW=0;
EN=1;
delay(10);//to produce delay
EN=0;
voidlcd_data(unsignedchardispdata)
P0=dispdata;
RS=1;
RW=0;
EN=1;
delay(10);//to produce delay
EN=0;
voidlcd_ini(void)
lcd_cmd(0x38);
lcd_cmd(0x0F);
lcd_cmd(0x01);
void delay(unsignedint t)//to produce delay
for(j=0;j<t;j++)
for(k=0;k<1000;k++)
{}
33
10.3 HEX CODE:
:03000000020B11DF
:0C0B1100787FE4F6D8FD75812E020B1DE4
:070B2800564F4C54414745B4
:0B0B1D00120ACC120ACC120A6280F807
:100ACC007590FFC2B1C2B4C2B3D2B27F017E000234
:020ADC000A9E70
:100A6200C2B5C2B6C2B7D2B1120A9AD2B4120A9AA7
:100A7200C2B1120A9AC2B4120A9A20B2FD120A9A9A
:100A8200D2B3120A9AAF907512008F13120A9AC249
:080A9200B3AF13AE1202095DBF
:10095D00752000752109AC20AD211208F68E148F7B
:10096D00157C037DE8120908EF2430F509E43EF506
:10097D0008AE14AF157C037DE81209088C168D178F
:10098D00AE16AF177C007D64120908EF2430F50D0B
:10099D00E43EF50CAE1AAF1B7C007D641209088C89
:1009AD00188D19AE1AAF1B7C007D0A120908EF24B1
:1009BD0030F50FE43EF50EAE1AAF1B7C007D0A122A
:1009CD0009088C1C8D1DE51D2430F511E4351CF531
:0409DD00100209E11A
:1009E10078287C007D007BFF7A0B79287E007F07C9
:1009F1001208D0120B027F80120ADEE4F522F523E1
:100A010074282523F8E6FF120AF07FF47E01120A0A
:100A11009E0523E52370020522C39407E522940075
:100A210040DE7FC0120ADEE4F522F523E5236401EE
:100A3100452270077F2E120AF08014E52325E02459
:100A410008F808E6FF120AF07FF47E01120A9E05FB
:100A510023E52370020522C39405E522940040CCCE
:010A61002272
:100ADE008F80C2A7C2A6D2A57F0A7E00120A9EC22E
:020AEE00A5223F
:100AF0008F80D2A7C2A6D2A57F0A7E00120A9EC20C
:020B0000A5222C
:0F0B02007F38120ADE7F0F120ADE7F01020ADE41
:040A9A007F017E005A
:100A9E00E4F524F525C3E5259FE5249E501FE4F5D6
:100AAE0026F5270527E52770020526B4E8F5E52685
:0E0ABE00B403F00525E52570DC052480D82260
:10080000E709F608DFFA8046E709F208DFFA803EDA
:1008100088828C83E709F0A3DFFA8032E309F608C7
:10082000DFFA8078E309F208DFFA807088828C832F
:10083000E309F0A3DFFA806489828A83E0A3F608E3
:10084000DFFA805889828A83E0A3F208DFFA804CBD
:1008500080D280FA80C680D4806980F28033801094
:1008600080A680EA809A80A880DA80E280CA8033FD
:1008700089828A83ECFAE493A3C8C582C8CCC58375
:10088000CCF0A3C8C582C8CCC583CCDFE9DEE78045
:100890000D89828A83E493A3F608DFF9ECFAA9F0C4
:1008A000EDFB2289828A83ECFAE0A3C8C582C8CC1A
:1008B000C583CCF0A3C8C582C8CCC583CCDFEADE33
:1008C000E880DB89828A83E493A3F208DFF980CC95
:1008D00088F0EF60010E4E60C388F0ED2402B4048E
:1008E0000050B9F582EB2402B4040050AF23234535
:0608F00082239008507302
:1008F600EF8DF0A4A8F0CF8CF0A428CE8DF0A42E16
:02090600FE22CF
:10090800BC000BBE0029EF8DF084FFADF022E4CCD3
:10091800F875F008EF2FFFEE33FEEC33FCEE9DEC9C
:10092800984005FCEE9DFE0FD5F0E9E4CEFD22EDE2
:10093800F8F5F0EE8420D21CFEADF075F008EF2F2C
:10094800FFED33FD4007985006D5F0F222C398FD1D
:050958000FD5F0EA22BA
:00000001FF
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10.4 HARDWARE INTERFACED OUTPUT:
10.5 CONCLUSION:
Finally We have successfully implemented Digital voltmeter.
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-:Interfacing of servo motor:-
11.1 AIM :
Implement Interfacing of servo motor with 8051 microcontroller.
11.2 ASSEMBLY PROGRAM:
// Author: SHEELAJ BABU
// Date: 29-May-2020
ORG00H//Start the program
MAIN:
MOV TMOD, #01H;using Timer 0 in Mode 1
LCALL zero_degrees;Function to move to position = 0 deg
LCALL delay ;Function to create a delay of 1 sec
LCALL ninety_degrees;Function to move to position = 90 deg
LCALL delay ;Function to create a delay of 1 sec
LCALL one_eighty_degrees;Function to move to position = 180 deg
LCALL delay ;Function to create a delay of 1 sec
SJMP MAIN ;to repeat the loop until manually stopped
RET
zero_degrees://To create a pulse of 1ms
MOV TH0, #0FCH;to be calculated
MOV TL0, #19H;to be calculated
SETBP2.0 ;Make P2.0 HIGH
SETBTR0 ;Start the timer 0
WAIT1:JNB TF0, WAIT1 ;Wait till the TF0 flag is set
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CLR P2.0 ;Make P2.0 LOW
CLR TF0 ;Clear the flag manually
CLR TR0 ;Stop the timer 0
RET
ninety_degrees://To create a pulse of 1.5ms
MOV TH0, #0FAH;to be calculated
MOV TL0, #25H;to be calculated
SETBP2.0 ;Make P2.0 HIGH
SETBTR0 ;Start the timer 0
WAIT2:JNB TF0, WAIT2 ;Wait till the TF0 flag is set
CLR P2.0 ;Make P2.0 LOW
CLR TF0 ;Clear the flag manually
CLR TR0 ;Stop the timer 0
RET
one_eighty_degrees://To create a pulse of 2ms
MOV TH0, #0F8H;to be calculated
MOV TL0, #31H;to be calculated
SETBP2.0 ;Make P2.0 HIGH
SETBTR0 ;Start the timer 0
WAIT3:JNB TF0, WAIT3 ;Wait till the TF0 flag is set
CLR P2.0 ;Make P2.0 LOW
CLR TF0 ;Clear the flag manually
CLR TR0 ;Stop the timer 0
RET
delay://To create a delay of 1sec
MOV R4,#64H;to be calculated
LOOP1:MOV R3,#64H;to be calculated
LOOP2:MOV R2,#64H;to be calculated
LOOP3:DJNZ R2,LOOP3
DJNZ R3,LOOP2
DJNZ R4,LOOP1
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RET
END
11.3 HEX CODE:
:1000000075890112001812005412002C12005412AB
:10001000004012005480E922758CFC758A19D2A028
:10002000D28C308DFDC2A0C28DC28C22758CFA7527
:100030008A25D2A0D28C308DFDC2A0C28DC28C2266
:10004000758CF8758A31D2A0D28C308DFDC2A0C2D9
:100050008DC28C227C647B647A64DAFEDBFADCF687
:01006000227D
:00000001FF
11.4 SIMULATED OUTPUT:
Wavform at P2.0 which confirms tha P2 output:
11.5 CONCLUSION:
Servo motor is interfaced with 8051 microcontroller successfully and works according to
instructions given by the 8051 microcontroller.
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39
CERTIFICATE
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