ORG 00H
 START: MOV P1,#11111110B
	CALL DELAY
	MOV P1,#11111100B
	CALL DELAY
	MOV P1,#11111000B
	CALL DELAY
	MOV P1,#11110000B
	CALL DELAY
	MOV P1,#11100000B
        CALL DELAY
	MOV P1,#11000000B
        CALL DELAY
	MOV P1,#10000000B
        CALL DELAY
	MOV P1,#00H
        CALL DELAY
	JMP START
DELAY: MOV R3,#8
   D1: MOV R4,#20
   D2: MOV R5,#248
       DJNZ R5,$
       DJNZ R4,D2
       DJNZ R3,D1
       RET
       END