#include<reg51.h>
#include<INTRINS.H>
unsigned char Count1,fen1,shi1,miao1;
sbit RELAY=P1^0;
void main(void)
{
TMOD=0x01;
IE=0x82;
TH0 = (65536-45872)/256;
TL0 = (65536-45872)%256;
TR0=1;
while(1);//按键或别滴程序
}

void T0_Int() interrupt 1
{
  TH0 = (65536-45872)/256;
  TL0 = (65536-45872)%256;
  Count1++;
  if(Count1==20)
  {
    Count1=0;
    miao1--;
    if(miao1==-1)
    {
      fen1--;
      miao1=59;
      if(fen1==-1)
      {
        //TR0=0;在按键中启动
        shi1--;
        fen1=59;
        if(shi1==0)shi1=0;
        shi1=0;
        miao1=0;
        fen1=0;
        RELAY=~RELAY; //继电器动作
      }
    }
  }
}