Micro controller Lab

1

MICROCONTROLLER LAB

PROGRAMS

SUB CODE: 10ESL47

Microcontroller

ALP

2

1. Write an Assembly Language Program to ADD two 8-

bit numbers.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, #09H

ADD A, #06H

RET

Result:

Before Execution After Execution

A

3

2. Write an ALP to subtract two 8-bit numbers.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, #09H

SUBB A, #05H

RET

Result:


A

4

3. Write an ALP to ADD two 16 bit numbers.

CPU 8051.TBL

HOF INT8

ORG 6000H

CLR C

MOV A, #17H

ADD A, #12H

MOV R0, A ; lower 8-bit addition saved to R0

MOV A, #15H

ADD A, #13H

MOV R1, A ; upper 8-bit addition saved to R1

RET

Result:


R0

5

4. Write an ALP to subtract two 16-bit numbers.

CPU 8051.TBL

HOF INT8

ORG 6000H

CLR C

MOV A, #17H

SUBB A, #12H

MOV R0, A ; lower 8-bit subtraction saved to R0

MOV A, #15H

SUBB A, #13H

MOV R1, A ; upper 8-bit subtraction saved to R1

RET

Result:


R0

6

5. ALP for 8-bit addition with carry.

CPU 8051.TBL

HOF INT8

ORG 6000H

CLR C

MOV R0, #00H ; clear R0 for carry

MOV A, #98H

ADDC A, #0F4H

MOV R1,A ; copy result to R1

JNC GO ; jump on NO carry

MOV R0, #01H ; copy carry into R0

GO: RET

Result:


A

7

6. ALP for 16-bit addition with carry. CPU 8051.TBL

HOF INT8

ORG 6000H

CLR C

MOV R0, #00H ; clear R0 for carry

MOV A, #98H

ADDC A, #0F4H

MOV R2,A ; lower 8-bit addition saved to R1

MOV A, #98H

ADDC A, #0F4H

MOV R1,A ; upper 8-bit addition saved to R2

JNC GO ; jump on NO carry

INC R0 ; increment R0 i.e. carry

GO: RET

Result:


R2

8

7. Write an ALP to ADD 8-bit BCD numbers.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, 30H

ADD A, 31H

DAA ; Decimal Adjust Accumulator

MOV 35H, A

RET

Result:


30H

9

8. WALP to multiply two 8-bit numbers. CPU8051.TBL

HOFINT8

ORG 6000H

MOV A, 30H

MOV 0F0H, 31H ; 0F0H is mem location for reg B

MUL AB

MOV 35H, A

MOV 36H, 0F0H

RET

Result:

Before Execution: After Execution:

30H

10

9. WALP to divide two 8-bit numbers. CPU8051.TBL

HOFINT8

ORG 6000H

MOV A, 30H

MOV 0F0H, 31H

DIV AB

MOV 35H, A

MOV 36H, 0F0H

RET

Result:

Before Execution: After Execution:

30H

11

10. WALP to find square of the given number. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, 30H

MOV 0F0H, A

MUL AB

MOV 35H, A

MOV 36H, 0F0H

RET

Result:


30H

12

11. WALP to find the cube of a given number.

CPU8051.TBL

HOFINT8

ORG 6000H

MOV A, 30H

MOV 0F0H, A

MUL AB

MOV 0F0H, 30H

MUL AB

MOV 35H, A

MOV 36H, 0F0H

RET

Result:


30H

13

12. WALP to add multiple byte numbers. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R2, #07H

MOV R0, #20H

MOV R1, #30H

MOV DPTR, #7000H

UP: MOV A, @R0

ADDC A, @R1

MOVX @DPTR, A

INC R0

INC R1

INC DPTR

DJNZ R2, UP

RET

Result:


20H

14

13. WALP to subtract multiple byte numbers. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R2, #07H

MOV R0, #20H

MOV R1, #30H

MOV DPTR, #7000H

UP: MOV A, @R0

SUBB A, @R1

MOVX @DPTR, A

INC R0

INC R1

INC DPTR

DJNZ R2, UP

RET

Result:


20H

15

14. WALP to COUNT number of 1s & 0s in a number. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R2, #08H

MOV A, 30H

MOV R0, #00H

MOV R1, #00H

CLR C

UP: RRC A

JNC GO

INC R1

SJMP LAST

GO: INC R0

LAST: DJNZ R2, UP

RET

Result:


30H

16

15. WALP to find average of n numbers. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R2, #05H

MOV 0F0H, #05H

MOV R0, #30H

CLR A

UP: ADD A,@R0

INC R0

DJNZ R2, UP

DIV AB

MOV R1, A

RET

Result:


30H

17

16. WALP to find even & odd from given array.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV 0D0H, #00H ; clear the PSW

MOV DPTR, #5000H

MOV R0, #30H

MOV R1, #20H

MOV R3, #05H

UP: MOVX A,@DPTR

RRC A

JNC NEXT

MOVX A,@DPTR

MOV @R1, A

INC R1

SJMP SKIP

NEXT: MOVX A,@DPTR

MOV @R0, A

INC R0

SKIP: INC DPTR

DJNZ R3, UP

RET

18

Result:


5000H

19

17. WALP to find positive & negative from given array.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV 0D0H, #00H ; clear the PSW

MOV DPTR, #5000H

MOV R0, #30H

MOV R1, #20H

MOV R3, #05H

UP: MOVX A,@DPTR

RLC A

JNC NEXT

MOVX A,@DPTR

MOV @R1, A

INC R1

SJMP SKIP

NEXT: MOVX A,@DPTR

MOV @R0, A

INC R0

SKIP: INC DPTR

DJNZ R3, UP

RET

20

Result:


5000H

21

18. WALP for Fibonacci series. Method-1: Method-2:

CPU 8051.TBL CPU 8051.TBL

HOF INT8 HOF INT8

ORG 6000H ORG 6000H

MOV A, #00H MOV R2, #0AH

MOV 30H, A MOV R0, #30H

MOV R0, #31H MOV @R0, #00H

MOV @R0, #01H DEC R2

MOV R2, #08H INC R0

UP: MOV 0F0H,@R0 MOV @R0, #01H

ADD A, @R0 DEC R2

INC R0 UP: MOV A,@R0

MOV @R0, A DEC R0

MOV A, 0F0H ADD A,@R0

DJNZ R2, UP INC R0

RET INC R0

MOV @R0, A

DJNZ R2, UP

RET

Result:


30H

22

19. WALP to find factorial of a number.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, 30H

MOV R2, A

DEC R2

UP: MOV 0F0H, R2

MUL AB

DJNZ R2, UP

RET

Result:


30H

23

20. WALP to find value of an expression (A+B) (A-B).

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, 30H

CLR C

ADDC A, 31H

MOV 0F0H, A

MOV A, 30H

SUBB A, 31H

MUL AB

RET

Result:


30H

24

21. WALP to find value of an expression w2-y/z+y2. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, 30H

MOV 0F0H, 30H

MUL AB

MOV R0, A

MOV A, 31H

MOV 0F0H, 31H

MUL AB

ADD A, R0

MOV R1, A

MOV A, 31H

MOV 0F0H, 32H

DIV AB

MOV R2, A

MOV A, R1

SUBB A, R2

RET

Result:


30H

25

22. WALP to interchange 1 RAM location content to

another RAM location.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R0, #30H

MOV R1, #50H

MOV R2, #05H

UP: MOV A,@R0

XCH @R1, A

MOV @R0, A

INC R0

INC R1

DJNZ R2, UP

RET

Result:


30H

26

23. WALP to copy the content of RAM location to ROM

location.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV DPTR, #5000H

MOV R1, #30H

MOV R2, #05H

UP: MOV A,@R1

MOVX @DPTR, A

INC DPTR

INC R1

DJNZ R2, UP

RET

Result:


RAM ROM (copied) RAM ROM (copied)

30H

27

24. WALP to interchange the content of RAM location to

ROM location.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV DPTR, #5000H

MOV R1, #30H

MOV R2, #05H

UP: MOVX A,@DPTR

XCH @R1, A

MOVX @DPTR, A

INC DPTR

INC R1

DJNZ R2, UP

RET

Result:


30H

28

25. WALP to clear RAM & ROM location. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV DPTR, #5000H

MOV R1, #30H

MOV R2, #0AH

UP: MOV @R1, #00H

MOV A, #00H

MOVX @DPTR, A

INC DPTR

INC R1

DJNZ R2, UP

RET

Result:


RAM ROM RAM ROM

30H

29

26. WALP to find smallest in a given array. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R1, #30H

MOV R2, #05H

MOV R0, #0FFH

AGAIN: MOV A,@R1

MOV 30H, R0

CJNE A, 30H, DOWN

SJMP SKIP

DOWN: JNC SKIP

MOV R0, A

SKIP: INC R1

DJNZ R2, AGAIN

RET

Result:


08H 30H

30

27. WALP to find greatest in a given array. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R1, #30H

MOV R2, #05H

MOV R0, #00H

AGAIN: MOV A,@R1

MOV 30H, R0

CJNE A, 30H, DOWN

SJMP SKIP

DOWN: JC SKIP

MOV R0, A

SKIP: INC R1

DJNZ R2, AGAIN

RET

Result:


08H 30H

31

28. WALP to set the given array in ascending order. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R3, #05H

UP: MOV DPTR, #5000H

MOV R2, #04H

AGAIN: MOV R1, 82H

MOVX A,@DPTR

MOV 30H, A

INC DPTR

MOVX A,@DPTR

CJNE A, 30H, DOWN

SJMP SKIP

DOWN: JNC SKIP

MOV 82H, R1

MOVX @DPTR, A

INC DPTR

MOV A, 30H

MOVX @DPTR, A

SKIP: DJNZ R2, AGAIN

DJNZ R3, UP

RET

Result:


08H 01H 5000H

32

29. WALP to set the given array in descending order. CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R3, #05H

UP: MOV DPTR, #5000H

MOV R2, #04H

AGAIN: MOV R1, 82H

MOVX A,@DPTR

MOV 30H, A

INC DPTR

MOVX A,@DPTR

CJNE A, 30H, DOWN

SJMP SKIP

DOWN: JC SKIP

MOV 82H, R1

MOVX @DPTR, A

INC DPTR

MOV A, 30H

MOVX @DPTR, A

SKIP: DJNZ R2, AGAIN

DJNZ R3, UP

RET

Result:


08H 09H 5000H

33

30. WALP to unpack a pack number.

Method-1: Method-2 (using logical instrucn):


HOF INT8 HOF INT8

ORG 6000H ORG 6000H

MOV A, R0 MOV A, R0

MOV 0F0H, #10H ANL A, #0FH

DIV AB MOV R6, A

MOV R1, A MOV A, R0

MOV R2, 0F0H ANL A, #0F0H

RET SWAP A

MOV R1, A

MOV A, R6

MOV R2, A

RET

Result:


85H R0

34

31. WALP to pack the unpack numbers.

Method-1: Method-2:


HOF INT8 HOF INT8

ORG 6000H ORG 6000H

MOV A, R0 MOV A, R0

MOV 0F0H, #10H SWAP A

MUL AB ADD A, R1

ADD A, R1 MOV R2, A

MOV R2, A RET

RET

Result:


08H R0

35

32. WALP to convert BCD to ASCII.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV DPTR, #5000H

MOVX A,@DPTR

CLR C

ADDC A, #30H

INC DPTR

MOVX @DPTR, A

RET

Result:


5000H

36

33. WALP to convert ASCII to BCD number.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV DPTR, #5000H

MOVX A,@DPTR ; input no. must be > 30

CLR C

SUBB A, #30H

INC DPTR

MOVX @DPTR, A

RET

Result:


5000H

37

34. WALP to convert ASCII to hexadecimal.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV R1, #50H

MOV A,@R1

CLR C

SUBB A, #41H

MOV A,@R1

JC SKIP

CLR C

SUBB A, #07H

SKIP: CLR C

SUBB A, #30H

INC R1

MOV @R1, A

RET

Result:


50H

38

35. WALP to convert decimal no. to hexadecimal.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, 20H

ANL A, #0F0H

SWAP A

MOV 0F0H, #0AH

MUL AB

MOV R2, A

MOV A, 20H

ANL A, #0FH

ADD A, R2

MOV R0, A

RET

Result:


20H

39

36. WALP to convert decimal no. to hexadecimal.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, 30H

MOV 0F0H, #0AH

DIV AB

MOV 33H, 0F0H

MOV 0F0H, #0AH

DIV AB

MOV 31H, A

MOV 32H, 0F0H

RET

Result:


FFH 30H

40

37. WALP to generate binary up-counter.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, #00H

UP: LCALL 061DH

MOV R3, A

MOV R4, #00H

MOV R5, #02H

LCALL 059EH

ADD A, #01H

CJNE A, #00H, UP

RET

Result:


00 00

01 01

02 02

03 03

. .

. .

. .

FC FC

FD FD

FE FE

FF FF

41

38. WALP to generate binary down-counter.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, #0FFH

UP: LCALL 061DH

MOV R3, A

MOV R4, #00H

MOV R5, #02H

LCALL 059EH

SUBB A, #01H

CJNE A, #0FFH, UP

RET

Result:


FF FF

FE FE

FD FD

FC FC

. .

. .

. .

04 04

03 03

02 02

01 01

00 00

42

39. WALP to generate BCD up-counter from 25 to 51.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, #25H

UP: LCALL 061DH

MOV R3, A

MOV R4, #00H

MOV R5, #02H

LCALL 059EH

ADD A, #01H

DA A

CJNE A, #51H, UP

RET

Result:


25 25

26 26

27 27

28 28

. .

. .

. .

47 47

48 48

49 49

50 50

43

40. WALP to generate BCD down counter.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, #99H

UP: LCALL 061DH

MOV R3, A

MOV R4, #00H

MOV R5, #02H

LCALL 059EH

ADD A, #99H

DA A

CJNE A, #99H, UP

RET

Result:


99 99

98 98

97 97

96 96

. .

. .

. .

4 4

3 3

2 2

1 1

44

41. WALP to generate BCD up counter.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, #00H

UP: LCALL 061DH

MOV R3, A

MOV R4, #00H

MOV R5, #02H

LCALL 059EH

ADD A, #01H

DA A

CJNE A, #00H, UP

RET

Result:


00 00

01 01

02 02

03 03

. .

. .

. .

96 96

97 97

98 98

99 99

45

42. WALP to generate BCD up-down counter.

CPU 8051.TBL

HOF INT8

ORG 6000H

MOV A, #00H

UP: LCALL 061DH

MOV R3, A

MOV R4, #00H

MOV R5, #02H

LCALL 059EH

ADD A, #01H

DA A

CJNE A, #00H, UP

MOV A, #99H

UP1: LCALL 061DH

MOV R3, A

MOV R4, #00H

MOV R5, #02H

LCALL 059EH

ADD A, #99H

DA A

CJNE A, #99H, UP1

RET

46

Result:


00 00

01 01

02 02

03 03

. .

. .

. .

96 96 97 97

98 98

99 99

99 99

98 98

97 97

96 96

. .

. .

. .

04 04

03 03

02 02

01 01

00 00

Micro controller Lab

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