2. Data Movement
a) Move a block of data within internal RAM
8051 ALP code
ORG 00H
MOV R1,#50H
MOV RO,#60H
MOV R3,#0AH
LOOP:MOV A,@R1
MOV @R0,A
INC R1
INC R0
DJNZ R3,LOOP
HERE:SJMP HERE
END
Result : Enter 10 numbers in the memory location d:0x59.Run
the program and see the result in memory location d:0x60 to
0x69
Sample Run:
Before execution: d:0x50 = 45 25 60 25 60 55 44 12 41 58
After execution : d:0x60 = 45 25 60 25 60 55 44 12 41 58
3. b) Exchange a block of data between internal RAM and
External memory
8051 ALP code
ORG 00H
MOV R0,#50H //SOURCE ADDRESS
MOV DPTR,#0150H //DESTINATION ADDRESS
MOV R3,#05H //COUNT
BACK:MOV A,@R0
MOV R2,A
MOVX A,@DPTR
MOV @R0,A
XCH A,R2
MOVX @DPTR,A
INC R0
INC DPTR
DJNZ R3,BACK
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x50 = 45 58 52 92 25
After execution : x:0x0150 = 45 58 52 92 25
4. Arithmetic Operation :
a)Evaluate simple arithmetic expression such as y=((5*2)-(4-1))/3)%2
8051 ALP code
ORG 00H
MOV A,#4
MOV R1,#1
ADD A,R1
MOV R1,A
MOV B,#05H
MOV A,#02H
MUL AB
SUBB A,R1
MOV B,#03H
DIV AB
MOV 30H,A
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x30 = 00
After execution : d:0x30 = 01
5. b)Addition of three 8-bit BCD numbers and obtain result in BCD form
8051 ALP code
ORG 00H
START:MOV R0,#02H
MOV R2,#00H
MOV R1,#50H
MOV A,@R1
INC R1
UP : ADD A,@R1
DA A
JNC NEXT
INC R2
NEXT : INC R1
DJNZ R0,UP
MOV O3H,A
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x50 = 05 06 04
After execution : d:0x02 = 00 15
6. Logical Operation :
a)Evaluate logical expression Y=a&&b||c^!d where a,b,c and d
are 8-bit data
8051 ALP code
ORG 00H
MOV R0,40H
MOV A,41H
ANL A,R0
MOV B,A
MOV R0,42H
MOV A,43H
CPL A
XRL A,R0
ORL A,B
MOV 44H,A
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x40 = 45 56 14 85
After execution : d:0x44 = 6E
7. b)Rotation or Shift operation on 16 bit data
8051 ALP code
ORG 00H
CLR C
MOV A,41H
RLC A
MOV B,A
MOV A,40H
RLC A
MOV 40H,A
MOV A,B
MOV ACC.0,C
MOV 41H,A
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x40 = 45 56
After execution : d:0x44 = 8A A C
8. Code Conversions :
a)(1)Two digit packed BCD to unpacked BCD
8051 ALP code
ORG 00H
MOV A,40H
MOV B,A
ANL A,#0F0H
SWAP A
MOV 41H,A
MOV A,B
ANL A,#0FH
MOV 42H,A
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x40 = 32
After execution : d:0x41 = 03 02
9. a)(2)Two digit unpacked BCD to packed BCD
8051 ALP code
ORG 00H
MOV A,40H
SAWP A
ORL A,41H
MOV 42H,A
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x40 = 03 02
After execution : d:0x44 = 32
10. b)(1) BCD to Binary Conversion
8051 ALP code
ORG 00H
MOV DPTR,#40H
MOVX A,@DPTR
ANL A,#0F0H
SWAP A
MOV B,#0AH
MUL AB
MOV R1,A
MOVX A,@DPTR
ANL A,0FH
ADD A,R1
INC DPTR
MOVX @DPTR,A
HERE:SJMP HERE
END
Sample Run:
Before execution: X:0x0040 = 45(Decimal/BCD)
After execution : X:0x0041 = 2D(Hex/Binary value)
11. b)(2) Binary to BCD Conversion
8051 ALP code
ORG 00H
MOV DPTR,#9000H
MOVX A,@DPTR
MOV B,#10
DIV AB
INC DPTR
XCH A,B
MOVX @DPTR,A
XCH A,B
MOV B,#10
DIV AB
INC DPTR
MOVX A,@DPTR
HERE:SJMP HERE
END
Sample Run:
Before execution: X:0x9000 = FF(Hex/Binary value)
After execution : X:0x9001 = 05(BCD Value)lower digit first
X:0x9002H = 05(BCD Value)
X:0x9002H = 02(BCD Value)Higher digit first
12. c)(1) Two digit packed BCD to ASCII
8051 ALP code
ORG 00H
MOV R1,#50H
MOV A,@R1
MOV R2,A
SWAP A
ANL A,#OFH
ORL A,#30H
INC R1
MOV @R1,A
MOV A,R2
ANL A,#0FH
ORL A,#30H
INC R1
MOV @R1,A
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x50 = 48
After execution : d:0x51 = 34 38
13. b)(2) Binary to BCD Conversion
8051 ALP code
ORG 00H
CLR C
MOV A,40H
SUBB A,#30H
SWAP A
MOV B,A
CLR C
MOV A,41H
SUBB A,#30H
ADD A,B
MOV 42H,A
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x40 = 34 38
After execution : d:0x42 = 48
14. Program to search a given 8bit number in an array of N numbers.
8051 ALP code
ORG 00H
MOV R0,#40H
MOV R1,#0AH
MOV A,#76H
BACK:MOV B,@RO
CJNE A,B,NEXT
MOV A,OFFH
SJMP LAST
NEXT:INC R0
DJNZ R1,BACK
MOV A,#0AAH
LAST:MOV 78H,B
HERE:SJMP HERE
END
Sample Run:
Before execution: d:0x40 = 45 58 39 45 89 45 22 69 76 33
Reg B = 76
After execution : d:0x78 = FF
15. a)To sort an array of an 6 byte of data in ascending order.
8051 ALP code
ORG 00H
MOV R0,#50
L1:MOV DPTR,#9000H
MOV A,R0
MOV R1,A
L2:MOVX A,@DPTR
MOV B,A
INC DPTR
MOVX A,@DPTR
CLR C
MOV R2,A
SUBB A,B
JNC NOEXCHG
MOV A,B
MOVX @DPTR,A
DEC DPL
MOV A,R2
MOVX @DPTR,A
INC DPTR
NOEXCHG:DJNZ R1,L2 Sample Run:
DJNZ RO,L1 Before execution:X:0x9000 = 45 58 39 45 89 95
HERE:SJMP HERE After execution :X:0x9000 = 39 45 45 58 89 95
END
16. a)To sort an array of an 6 byte of data in descending order.
8051 ALP code
ORG 00H
MOV R0,#50
L1:MOV DPTR,#9000H
MOV A,R0
MOV R1,A
L2:MOVX A,@DPTR
MOV B,A
INC DPTR
MOVX A,@DPTR
CLR C
MOV R2,A
SUBB A,B
JC NOEXCHG
MOV A,B
MOVX @DPTR,A
DEC DPL
MOV A,R0
MOVX @DPTR,A
INC DPTR
NOEXCHG:DJNZ R1,L2 Sample Run:
DJNZ RO,L1 Before execution:X:0x9000 = 45 58 39 45 89 95
HERE:SJMP HERE After execution :X:0x9000 = 95 89 58 45 45 39
END
17. Program to count the number of ones and zeros in the data
saved in two consecutive memory location.
8051 ALP code
ORG 00H
MOV R0,#00H
MOV R1,#00H
MOV R2,#08H
MOV A,#0F0H
LOOP3:CLR C
RLC A
JC LOOP1
INC R0
SJMP LOOP2
LOOP1:INC R1
LOOP2:DJNZ R2,LOOP3
HERE:SJMP HERE
END
Sample Run:
Input for execution : Ri = OFOH
Output of execution : R0 = 04
R1 = 04
18. Program to toggle a particular bit in the internal RAM with the
delay of N ms given the clock frequency f MHz with the use of
delay subroutine.
8051 ALP code
ORG 00H
AGAIN:
SETB P1.2
ACALL DELAY
CLR P1.2
ACALL DELAY
SJMP AGAIN
DELAY:MOV TMOD,#10H
MOV TL1,#0B0H
MOV TH1,3CH
SETB TR1
BACK:
JNB TF1,BACK
CLR TR1
CLR TF1
RET
END
Result : Run the program and observe the toggling of P1.2 bit.
