Mic practicals

Practical
Manual
Microcontroller
Prof. Suraj R. Gaikwad

Prof. Suraj R. Gaikwad MIC
Exp: 1) To write an assembly language program for arithmetic operations.
Program:
1) MOV A,#20H
MOV F0,#20H
ADD A,F0
RET
2) MOV A,#20H
MOV F0,#10H
SUB A,F0
RET
3) MOV A,#04H
MOV F0,#02H
MUL A,F0
RET
4) MOV A,#10H
MOV F0,#02H
ADD A,F0
RET
Results:
Addition: A = 40H
Subtraction: A = 0AH
Multiplication: A = 08H
Division: A = 05H

Exp:2) To develop an assembly language program to transfer block of 10
bytes stored in internal data memory from location 40H to 60H.
Program:
ORG 0000H
MOV R0,#40H
MOV R1,#60H
MOV R2,#0AH
LOOP:MOV A,@R0
MOV @R1,A
INC R0
INC R1
DJNZ R2, LOOP
END

Exp:3) To develop an assembly language program to get square of numbers.
Program:
ORG 0000H
MOV R0,#40H
MOV R1,#60H
MOV R2,#0AH
LOOP1:MOV A,@R0
MOV B,@R0
MUL AB
MOV @R1,A
INC R0
INC R1
DJNZ R2,LOOP1
END
Result:
Input:
Output:
00H = 0D
01H = 1D
04H = 4D
09H = 9D
10H = 16D
19H = 25D
24H = 36D
31H = 49D
40H = 64D
51H = 81D

Exp:4) To develop program for arranging 10 numbers in descending order.
Program:
ORG 00H
ARR EQU 70H
L0:MOV R1,#ARR
MOV R0,#ARR
MOV R2,#0AH
MOV R3,#00H
DEC R2
L1:MOV A,@R0
MOV B,A
INC R1
SUBB A,@R1
JNC L2
MOV A,B
XCH A,@R1
MOV @R0,A
MOV R3,#01H
L2:INC R0
DJNZ R2,L1
CJNE R3,#00,L0
SJMP $
END
Result:
Input:
Output:

Exp:5) To develop a program to generate Square wave over port pins.
Program:
ORG 0000H :initialization
MOV TMOD,#10H :move 10H into timer/counter mode control resister
UP:
MOV TL1,#0D2H :move 0D2H into timer 1 low byte
MOV TH1,#0FFH :move offH into timer 1 high byte
SETB TR1 :addressed TR1 is set, TR1=timer 1 run control bit
WAIT:
JNB TF1,WAIT :jump if addressed TR1 is 0, otherwise
proceed with next instruction
CLR TR1 :adressed TR1 is cleared
CPL P1.5 : complement the addressed P1.5
CLR TF1 : adressed TF1 is cleared, TF1=timer 1 overflow flag
SJMP UP :program branches unconditionally to address indicated
END :end
Result:

Exp:6) To generate Square wave using DAC.
Circuit Diagram:
C Program:
#include <REG51xD2.H>
#include <stdio.h>
sbit Amp = P3^3; /* Port line to change amplitude */
sbit Fre = P3^2; /* Port line to change frequency */
void delay(unsigned int x) /* delay routine */
{
for(;x>0;x--);
}
main()
{
unsigned char on = 0x7f,off=0x00;
unsigned int fre = 100;
while(1)

{
if(!Amp) /* if user choice is to change amplitude */
{
while(!Amp); /* wait for key release */
on+=0x08; /* Increase the amplitude */
}
if(!Fre) /* if user choice is to change frequency */
{
if(fre > 1000) /* if frequency exceeds 1000 reset to default */
fre = 100;
while(!Fre); /* wait for key release */
fre += 50; /* Increase the frequency */
}
P0=on; /* write amplitude to port */
P1=on;
delay(fre);
P0 = off; /* clear port */
P1 = off;
delay(fre);
}
}
Output Waveform:

Assembly Program:
ORG 0000H
MOV DPTR, #8000H
UP:MOV DPL,#40H
MOV DPH,#40H
CLR A
MOVC A,@A+DPTR
SETB P1.5
WAIT:JNB P1.5,WAIT
CLR P1.5
SJMP UP
END
Output Waveform:

Exp:7) To write a program to drive Stepper Motor.
Theory:
Driving Unipolar Stepper Motor with 8051:
Unipolar stepper motors can be used in three modes namely the Wave Drive, Full
Drive and Half Drive mode.
Half Drive Stepping Sequence

Interfacing Using L293D:
Interfacing Using ULN2003:

Programs:
Keil C Code for Wave Drive:

Keil C Code for Full Drive:

Keil C Code for Half Drive:

Result:
1) Wave drive stepper sequence:

2) Full drive stepping sequence:

3) Half wave stepping sequence:

Exp:8) To write a program to drive Stepper Motor in clockwise direction and
anti-clockwise direction.
Program:
ORG 0000H
MOV R2,#12H
MOV A,#88H
LOOP1: MOV P2,A
RR A
DJNZ R2, LOOP1
MOV R2,#12H
MOV A,#11H
LOOP2: MOV P2,A
RL A
DJNZ R2, LOOP2
END
Result:

Exp:9) To write a program to read keyboard and display code.
Diagram:
Program:
• Program to interface matrix keyboard 4x4
• Rows are connected to the Port pins P1.0-P1.3 & Columns are connected to
Port pins P2.0-P2.3
• Rows are grounded one by one and read columns Seven segment display is
connected at port P0
ORG 00H
AJMP START
ORG 13H
RETI
START:MOV P0,#00H
MOV P2,#0FH ; Port Pins P2.0 to P2.3 i/p pins and P2.4 to P2.7 o/p pins
MOV P1,#00H ; Port P0 output port
REL: MOV P1,#00H ; make all rows ground to check all keys
MOV A,P2 ; read port p2 to ensure that all keys released

ANL A,#0FH ; maks upper bits because they are not used
CJNE A,#0FH,REL ; check till all keys released
AGAIN: ACALL DELAY
MOV A,P2 ; see if any key pressed or not?
ANL A,#0FH ; mask upper bits
CJNE A,#0FH,KPRESS ; if a is not equal to 0fh then key is pressed
SJMP AGAIN ; check again if key is not pressed
KPRESS: ACALL DELAY
MOV A,P2 ;
ANL A,#0FH ; mask unused upper bits
CJNE A,#0FH,KPRESS1 ; if a is not equal to 0fh then key is pressed
SJMP AGAIN ; check again if key is not pressed
KPRESS1:
MOV P1,#0FEH ; ground row 0
MOV A,P2 ; read all columns
CJNE A,0FH,R_0 ; key is pressed in first row (row 0),check columns
MOV P1,#0FDH ; Ground ROW 1
CJNE A,0FH,R_1 ;key is pressed in second row (row 1),check columns
MOV P1,#0FBH ; ground row 2
CJNE A,0FH,R_2 ;key is pressed in third row (row 2),check columns
MOV P1,#0F7H ; ground row 0
CJNE A,0FH,R_3 ;key is pressed in fourth row (row 3),check columns
LJMP AGAIN
R_0: MOV DPTR,#KCODE0 ;set dptr=start of row 0
SJMP CHECK_C
SJMP CHECK_C
SJMP CHECK_C
CHECK_C:
RRC A ;check whether carry occurs or not
JNC GET_CODE

INC DPTR
SJMP CHECK_C
GET_CODE: CLR A
MOVC A,@A+dptr
MOV P0,A
LJMP REL
DELAY: MOV R7,#0FFh
DLOOP: MOV R6,#0FFh
D_LOOP: DJNZ R6,D_LOOP
DJNZ R7,DLOOP
RET
Result:
KCODE0: DB '0','1','2','3' ; These codes are for LCDs
KCODE1: DB '4','5','6','7' ; Replace this code by seven
KCODE2: DB '8','9','A','B' ; segment code as per your
KCODE3: DB 'C','D','E','F' ; Circuit.

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