点亮一盏灯

    ORG 0000H
    SJMP START
    ORG 0030H
START:  MOV SP,#60H
        MOV P0,#0FFH
    
MAIN:   CLR P0.7
        CALL DELAY
        SETB P0.7
        CALL DELAY
        SJMP MAIN
        
DELAY:  MOV R0, #250
   D2:  MOV R1, #250
   D1:  DJNZ R1, D1
        DJNZ R0, D2
        RET
        END

点亮一盏灯

原文：https://www.cnblogs.com/yasepix/p/11535440.html