QC:
MOV DPL,#00H
MOV R2,#8
CLR 00H
QC1:
MOV A,R2
DEC A
ADD A,DPL
MOV DPL,A
MOV DPH,#21H
MOVX A,@DPTR
MOV B,A
MOV DPH,#20H
MOVX A,@DPTR
MOV C,00H
SUBB A,B
MOV 00H,C
PUSH ACC
MOV A,#30H
ADD A,R2
DEC A
MOV R0,A
POP ACC
MOV @R0,A
DJNZ R2,QC1
RET
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