MOV	 A,#55H
AGAIN:	MOV	 P1,A
		ACALL DELAY
		CPL 	 A
		SJMP	 AGAIN
DELAY:	MOV	 R5,#2
HERE1:	MOV	 R4,#180
HERE2:	MOV	 R3,#255
HERE3:	DJNZ	 R3,HERE3
		DJNZ	 R4,HERE2
		DJNZ	 R5,HERE1
		RET