51单片机,汇编语言,流水灯问题,请高手赐教答: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 ...