10-6-2.asm

书籍8051入门篇

;10-6.2.ASM
$MOD51
TMH	EQU	(65536-9217)/256
TML	EQU	(65536-9217) MOD 256
B_RATE	EQU	0FDH
;
	ORG	0000H
	LJMP	START
	ORG	000BH
	LJMP	T0_ISR
	ORG	0023H
	LJMP	SERIAL
;
START:	MOV	TMOD,#21H
	MOV	TH0,#TMH
	MOV	TL0,#TML
	SETB	TR0
	MOV	TH1,#B_RATE
	SETB	TR1
	MOV	SCON,#50H
	SETB	ET0
	SETB	ES
	SETB	EA
LOOP:	SJMP	LOOP
;
T0_ISR:	CLR	TF0
	MOV	TH0,#TMH
	MOV	TL0,#TML
	RETI
;
SERIAL:	CLR	RI
	CLR	TI
	RETI
	END