完整的源碼下載地址：http://m.zg4o1577.cn/f/chcxde.rar
 /***采用2片595驅動，動態掃描原理顯示,需要單片機3路IO口（DIO接 P33  SCK接P32  RCK接P34），上電顯示時鐘****/
 #include <AT89X51.H>
 unsigned int tcount;
 unsigned char m;
 static unsigned char second,minute,hour;
 
 unsigned char code fseg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
 unsigned char code segbit[]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};
 unsigned char  disbuf[8]={0,0,0,0,0,0,0,0};

 //數據傳輸//
void sdata(void)
 {unsigned char b,c,num;

    if(b==0)
    { 
      b++;
    num=segbit[m];
     for(c=0;c<8;c++)
        {P3_2=0;
          P3_3=num&0x80;
          num<<=1;
          P3_2=1;
       }
   
    }

    if(b==1)

    { 
        b--;
      if(m==2||m==5)
      {num=0xbf;}
      else
       {num=fseg[disbuf[m]];}

        for(c=0;c<8;c++)
          {  P3_2=0;
             P3_3=num&0x80;
             num<<=1;
             P3_2=1;
          }
   
    }
         m++;
         if(m==8)
         {m=0;
          }
 }
//數據傳輸//

 //延時0.1ms個單位//

 void delay (unsigned char h)
  { while(h--);
  }
  //延時0.1ms個單位//

 
 //數據輸出//
void out(void)
 {P3_4=0;
  delay(50);
  P3_4=1;
 }
//數據輸出//

  //按鍵控制//
  void bcon(void)
   {if(P3_5==0)
     {delay(100);
       if(P3_5==0)
        {second=0;
          while(P3_5==0);
    
    }
     }
     disbuf[0]=second%10;
    disbuf[1]=second/10;

    if(P3_6==0)
     {delay(100);
       if(P3_6==0)
        {minute++;
          while(P3_6==0);
          if(minute==60)
           {minute=0;
           }
    }
     }
    disbuf[3]=minute%10;
    disbuf[4]=minute/10;

     if(P3_7==0)
     {delay(100);
       if(P3_7==0)
        {hour++;
          while(P3_7==0);
           if(hour==24)
            {hour=0;
    }
    }
     }
   
    disbuf[6]=hour%10;
    disbuf[7]=hour/10;
   
    disbuf[0]=second%10;
    disbuf[1]=second/10;
    disbuf[3]=minute%10;
    disbuf[4]=minute/10;
    disbuf[6]=hour%10;
    disbuf[7]=hour/10;

   }
   //鍵盤控制//

 
 
 
  //主函數//

void main(void)
 { 
  TMOD=0x02;
  TH0=0x06;
  TL0=0x06;
  TR0=1;
  ET0=1;
  EA=1;

  while(1)
  {
   bcon();
   sdata();
   out();

  }
  while(1);

 }
 //主函數//

 //中斷程序//

 void t0(void) interrupt 1 using 0
  { tcount++;

    if(tcount==4000)
      {tcount=0;
        second++;

         if(second==60)
          {second=0;
           minute++;

            if(minute==60)
             {minute=0;
              hour++;

              if(hour==24)
               {hour=0;
          }
        }
          }
      }
    }

   
  //中斷程序//

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