led.asm

单片机控制的led显示

light	bit	00h
	org	0
	ljmp	start
	org	3
	cpl	light
	reti
	org	30h;这句不明白是什么意思
start:	setb 	it0
	setb	ex0
	setb	ea
	mov	a,#0FEH
	setb	light
loop:	jnb	light,loop
	mov	p1,a
	lcall	delay
	rl	a
	sjmp	loop
delay:	mov	r1,#0
d1:	mov	r0,#0
	djnz	r0,$
	djnz	r1,d1
	ret
	end