#include <reg52.h>
  uint num ,index;
  uchar char nums[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x84,0xf8,0x80,0x98};
//代表0-9的數碼管的16進制值
  void main(){
  num=0;
  index=0;
  TMOD = 0x01;//設置定時器0為工作方式
  TH0 = (65536-50000)/256;//設置高八位 定時為50毫秒
  TL0 = (65536-50000)%256;
  EA=1; //開總中斷
  ET0=1; //開啟定時器0中斷
  TR0 =1;//啟動定時器中斷
  while(1){
    if(index==20)
    {
    //
    index=0;
    //設置顯示
       P0 = nums[num];
    num++;
    if(num>9)
    num=0;
    }
  }

  }
  void  timer0() interrupt 1 //定時器0中斷函數
  {
     TH0 = (65536-50000)/256;
  TL0 = (65536-50000)%256;
  index++;
  }