?? 1.3.2 多字節無符號數乘法.txt
字號:
DOMUL:
MOV A,R1
MOV R6,A
MOV A,R0
MOV R5,A
MOV A,R2
ADD A,R2
MOV 26H,A
MOV R7,A
MOV A,R4
MOV R0,A
CLEAR:
MOV @R0,#00H
INC R0
DJNZ R7,CLEAR
MOV A,R4
MOV R7,A
MOV 27H,R7
MOV 20H,R2
LP0:
MOV A,R5
MOV R0,A
MOV A,@R0
MOV B,@R1
MUL AB
ACALL ADDM
INC R1
DJNZ R2,LP0
MOV R2,20H
MOV A,R6
MOV R1,A
MOV A,R7
INC A
MOV R7,A
MOV R4,A
INC R5
DJNZ R3,LP0
MOV R4,27H
MOV R5,26H
RET
ADDM:
MOV 21H,A
MOV A,R4
MOV R0,A
MOV A,21H
ADD A,@R0
MOV @R0,A
MOV A,B
INC R0
ADDC A,@R0
MOV @R0,A
INC R0
MOV A,@R0
ADDC A,#00H
MOV @R0,A
DEC R0
MOV A,R0
MOV R4,A
RET
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