main2.c

基于单片机at89c51的mp3定时器设置及中断实验源代码

#include "AT89C51SND1_REG.H"

#define LED	     P3_5

unsigned char Counter=0;


void Timer0_ISR() interrupt	1  //Vector addr 0x002b
{
 	TR0 = 0;   //停止T0
	TH0 = 0x5d;
    TL0 = 0x3d;
	Counter++;
	if(Counter==40)	  
		{
			Counter=0;
			LED=~LED;
		}
	TR0 = 1; //重启T0
}

main()
{
	CKCON|= 0x02;
	TMOD &= 0xf0;
	TMOD |= 0x01; //设置T0为模式1定时器
	TH0 = 0x5d;
	TL0 = 0x3d;
	ET0 =1;//打开T0中断
	EA = 1;//打开中断
	TR0=1; //启动定时器T0
	while(1); 
}