cseg	at 0
	ljmp	MAIN
	cseg	at 0bh

TOISR:
	cpl	p1.0
	reti

	cseg	at 30h
MAIN:
	mov	TMOD,#20h
	mov	TH0,#-50
	setb	TR0
	mov	IE,#82h
	sjmp	$

end