p9_2.asm

单片机原理与应用实例教程 单片机原理与应用实例教程

		ORG		0000H
		LJMP	MAIN
		ORG		00013H
		LJMP	INT_1
		ORG		0023H
		LJMP	INT_TR

		ORG		4100H
MAIN:	MOV TMOD, #20H
		MOV TH1, #0E8H
		MOV TL1, #0E8H
		MOV PCON, #0H
		SETB TR1
		SETB ES

		MOV SCON, #50H

		SETB EX1
		SETB IT1
		MOV P1, #0FFH
		SETB EA

LOOP:	AJMP LOOP

INT_TR:	JNB RI, TR_SEND
		MOV P1, SBUF
		CLR RI
		RETI
TR_SEND:CLR TI
		RETI

INT_1:	MOV SBUF, P1
		RETI

		END