?? 1.3.3 雙字節有符號數乘法.txt
字號:
ORG 1000H
SDOMUL:
MOV R0,#20H
MOV A,@R0
ANL A,#80H
MOV R3,A
JZ L1
ACALL L0
L1:
INC R0
INC R0
MOV A,@R0
ANL A,#80H
MOV R2,A
JZ L2
ACALL L0
L2:
MOV A,R3
XRL A,R2
MOV 08H,A
MOV R2,#4
MOV R0,#20H
MOV R1,#07H
L3:
MOV A,@R0
MOV @R1,A
INC R0
DEC R1
DJNZ R2,L3
MOV R0,#30H
LCALL START
MOV A,80H
JNZ L4
SJMP L6
L4:
CLR C
MOV R0,#30H
MOV R3,#3
MOV A,@R0
CPL A
ADD A,#1
MOV @R0,A
L5:
INC R0
MOV A,@R0
CPL A
ADDC A,#0
MOV @R0,A
DJNZ R3,L5
L6:
RET
L0:
CLR C
INC R0
MOV A,@R0
CPL A
ADD A,#1
MOV @R0,A
DEC R0
MOV A,@R0
CPL A
ADDC A,#0
MOV @R0,A
RET
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