timer03.c

这是用51单片机开发的电子时钟

#include<reg52.h>
#include<intrins.h>
#define unit unsigned int
#define uchar unsigned char
uchar temp,time;
void delay(unit);
void main()
{
  TMOD=0x01;
  TH0=(65536-40000)/256;
  TL0=(65536-40000)%256;
  ET0=1;
  EA=1;
  TR0=1;
  time=0;
  temp=0xfe;
  while(1)
  {
  P0=0xff;
  P2=temp;
  temp=_crol_(temp,2);
  P2=temp;
  delay(300); 
  }
}
void OUT0() interrupt 1
{
  TH0=(65536-40000)/256;
  TL0=(65536-40000)%256;
  time++;
  if(time==25)
  {
   time=0;
   P0=0x80;
   delay(300);
  }

}
void delay(unit z)
{
  unit x,y;
  for(x=z;x>0;x--)
   for(y=110;y>0;y--);
}