#include 8051.H
         .org 0000H

Main	acall	Init		; initialise
run	jnb	RI,	$	; Wait RI flag
	mov	A,	SBUF	; Reade serial port
	mov	P1,	A	; move acc to P3
	clr	RI
	sjmp	run
	.end


Init	mov	TMOD,#20h 	;Timer 1 Auto-reload 
	mov	SCON,	#01010000b	
	mov	TH1,	#254
	setb	TR1		;start timer
	ret			; return