定时中断.txt

EA = 1 //开总中断 ET0 = 1 //允许定时器0中断 TMOD = 1 //定时器工作方式选择 TL0 = 0x06 TH0 = 0xf8 //定时器赋予初值

单片机定时中断程序 
 
#include <reg52.h>
sbit led1=P1^0;
sbit led2=P1^1;
sbit led3=P1^2;
sbit led4=P1^3;

#define LED_ON     0
#define LED_OFF    1

unsigned char count;
unsigned char delay1;
unsigned char delay2;
unsigned char delay3;
unsigned char delay4;

void timer0(void) interrupt 1 using 0
{
      TL0=0x06;
      TH0=0xf8;
      if (++count > 200){
          count = 0;
      }
}
void serial() interrupt 4 using 3
{

}

main(){
      EA = 1;           //开总中断
      ET0 = 1;          //允许定时器0中断

      TMOD = 1;         //定时器工作方式选择
      TL0 = 0x06;     
      TH0 = 0xf8;       //定时器赋予初值

      TR0 = 1;          //启动定时器

      delay1 = 4;
      delay2 = 2;
      delay3 = 4;
      delay4 = 2;

      while(1){
          if (count == 0){
              if (++delay1 > 4){
                  delay1 = 0;
        }
              if (++delay2 > 4){
                  delay2 = 0;
        }
              if (++delay3 > 4){
                  delay3 = 0;
        }
              if (++delay4 > 4){
                  delay4 = 0;
        }
       }
          if (delay1 < 2){
              led1 = LED_OFF;
       }
          else {
              led1 = LED_ON;
       }
          if (delay2 < 2){
              led2 = LED_OFF;
       }
          else {
              led2 = LED_ON;
       }
          if (delay3 < 2){
              led3 = LED_OFF;
       }
          else {
              led3 = LED_ON;
       }
          if (delay4 < 2){
              led4 = LED_OFF;
       }
          else {
              led4 = LED_ON;
       }
      }
}