?? t2
字號(hào):
; T2--BCD MULTIPLY
; M[10H]*M[11H]=>M[10H],M[11H]
; INPUT: M[10H]=33(BCD)
; M[11H]=11(BCD)
; OUTPUT:M[10H],M[11]=363(BCD)
;
ORGD 10H ; DATA AREA
DB 33H
DB 11H
;
ORG 00H ; PROGRAM AREA
MOV R0,#10H
MOV A,@R0
MOV R1,A
MOV R7,#03H
CLR A
MOV @R0,A
LOOP0: MOV R0,#10H
XCHD A,@R0
MOV R4,A
MOV A,@R0
RR A
RR A
RR A
RR A
MOV @R0,A
INC R0
MOV A,R4
XCHD A,@R0
MOV R2,A
MOV A,@R0
RR A
RR A
RR A
RR A
MOV @R0,A
MOV A,R2
JZ LOOP3
DEC R0
MOV A,@R0
MOV R3,#00H
LOOP1: CLR C
ADD A,R1
DA A
JNC LOOP2
INC R3
LOOP2: DJNZ R2,LOOP1
MOV @R0,A
MOV A,R3
LOOP3: DJNZ R7,LOOP0
END
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