定时器中断

#include "reg52.h"

typedef unsigned int u16;

sbit led = P2^0;


void Timer0Init(){
  TMOD |= 0X01;//选择为定时器0模式，工作方式1，仅用TR0打开启动。

  TH0 = 0XFC; //给定时器赋初值，定时1ms
  TL0 = 0X18; 
  ET0 = 1;//打开定时器0中断允许
  EA = 1;//打开总中断
  TR0 = 1;//打开定时器
}

void main(){  
  Timer0Init();  //定时器0初始化
  while(1);   
}

void Timer0() interrupt 1{
  static u16 i;
  TH0 = 0XFC; //给定时器赋初值，定时1ms
  TL0 = 0X18;
  i++;
  if(i == 500)
  {
    i = 0;
    led = ~led; 
  } 
}