89c51汇编流水灯上下循环

ORG 0000H LJMP MAIN ORG 0100H MAIN: MOV A,#0FEH MOV R5,#8 DEL: MOV R7,#200 DEL1: MOV R6,#250 DEL2: DJNZ R6,DEL2 DJNZ R7,DEL1 MOV P1,A RL A DJNZ R5,DEL mov R5,#8 DEL3: MOV R7,#200 DEL4: MOV R6,#250 DEL5: DJNZ R6,DEL5 DJNZ R7,DEL4 RR A MOV P1,A DJNZ R5,DEL3