start:
	SETB P3.3		
	SETB P3.4		
	MOV P1, #11111001B
	CALL delay
	CLR P3.3		
	MOV P1, #10100100B	
	CALL delay
	CLR P3.4		
	SETB P3.3		
	MOV P1, #10110000B	
	CALL delay
	CLR P3.3		
	MOV P1, #10011001B
	CALL delay
	JMP start		

delay:
	MOV R0, #200
	DJNZ R0, $
	RET