3_2.txt

This are the Laboratory programs for the 89c51

;16 BIT MULTIPLICATION
ORG 0000H
MOV A,70H
MOV B,72H
MUL AB
MOV 43H,A
MOV R0,B
MOV A,71H
MOV B,72H
MUL AB
MOV R1,A
MOV R2,B
MOV A,73H
MOV B,70H
MUL AB
MOV R3,A
MOV R4,B
MOV A,R0
ADD A,R1
JNC XXX
INC R7
XXX:
ADD A,R3
JNC YYY
INC R7
YYY:
MOV 42H,A
MOV A,71H
MOV B,73H
MUL AB
MOV R5,A
MOV R6,B
MOV A,R7
ADD A,R5
JNC ZZZ
SETB RS0
INC R1
CLR RS0
ZZZ:
ADD A,R4
JNC AAA
SETB RS0
INC R1
CLR RS0
AAA:
ADD A,R2
JNC BBB
SETB RS0
INC R1
CLR RS0
BBB:
MOV 41H,A
SETB RS0
MOV A,R1
CLR RS0
ADD A,R6
MOV 40H,A
END