digital clock.c

用51单片机设计的时钟电路（毕业论文）很不错的设计.值得参考

#include <AT89X51.H> 
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f, 
                               0x66,0x6d,0x7d,0x07, 
                               0x7f,0x6f,0x77,0x7c, 
                               0x39,0x5e,0x79,0x71,0x00}; 
unsigned char dispbitcode[]={0xfe,0xfd,0xfb,0xf7, 
                             0xef,0xdf,0xbf,0x7f}; 
unsigned char dispbuf[8]={0,0,16,0,0,16,2,1}; 
unsigned char dispbitcnt; 
unsigned char second; 
unsigned char minite; 
unsigned char hour; 
unsigned int tcnt; 
unsigned char mstcnt;  
unsigned char i,j; 
void main(void) 
{
  TMOD=0x02; 
  TH0=0x06; 
  TL0=0x06; 
  TR0=1; 
  ET0=1; 
  EA=1; 
  hour=12;
   while(1) 
    { 
      if(P0_0==0) 
        { 
          for(i=5;i>0;i--) 
          for(j=248;j>0;j--); 
          if(P0_0==0) 
            { 
              second++; 
              if(second==60) 
                { 
                  second=0; 
                } 
              dispbuf[0]=second%10; 
              dispbuf[1]=second/10; 
              while(P0_0==0); 
            } 
        } 
      if(P0_1==0) 
        { 
          for(i=5;i>0;i--) 
          for(j=248;j>0;j--); 
          if(P0_1==0) 
            { 
              minite++; 
              if(minite==60) 
                { 
                  minite=0; 
                } 
              dispbuf[3]=minite%10; 
              dispbuf[4]=minite/10; 
              while(P0_1==0); 
            } 
        } 
      if(P0_2==0) 
        { 
          for(i=5;i>0;i--) 
          for(j=248;j>0;j--); 
          if(P0_2==0) 
            { 
              hour++; 
              if(hour==24) 
                { 
                  hour=0; 
                } 
              dispbuf[6]=hour%10; 
              dispbuf[7]=hour/10; 
              while(P0_2==0); 
            } 
        } 
    } 
} 
void t0(void) interrupt 1 using 0 
{ 
 
  mstcnt++; 
  if(mstcnt==8) 
    { 
      mstcnt=0; 
	  
      P3=0xff;      //关闭所有显示
      P1=dispcode[dispbuf[dispbitcnt]]; 
      P3=dispbitcode[dispbitcnt]; 
      dispbitcnt++; 
      if(dispbitcnt==8) 
        { 
          dispbitcnt=0; 
        } 
    } 
  tcnt++; 
  if(tcnt==4000) 
    { 
      tcnt=0; 
      second++; 
      if(second==60) 
        { 
          second=0; 
          minite++; 
          if(minite==60) 
            { 
              minite=0; 
              hour++; 
              if(hour==24) 
                { 
                  hour=0; 
                } 
            } 
        } 
      dispbuf[0]=second%10; 
      dispbuf[1]=second/10; 
      dispbuf[3]=minite%10; 
      dispbuf[4]=minite/10; 
      dispbuf[6]=hour%10; 
      dispbuf[7]=hour/10; 
    } 
}