第1个回答 2013-05-26
ORG 0000H
LJMP START
ORG 0080H
START: MOV R7,#08H
MOV R4,#0FFH
PPP1: MOV R6,#7FH
MOV A,R7
MOV R5,A
PPP: MOV A,R6
RL A
MOV R6,A
ANL A,R4
MOV P1,A
MOV R0,#0FFH ;延时
MOV R1,#0FFH
PPP2: DJNZ R1,$
DJNZ R0,PPP2
DJNZ R5,PPP
MOV A,R4
CLR C
RRC A
MOV R4,A
DJNZ R7,PPP1
CLR A
CPL A
MOV P1,A
MOV R0,#0FFH ;延时
MOV R1,#0FFH
PPP3: DJNZ R1,$
DJNZ R0,PPP3
SJMP START
END
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