t602.c

C语言开发的数字钟程序

#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 second; 

unsigned char tcount; 

void main(void)
{
  TMOD=0x01;
  TH0=(65536-50000)/256;
  TL0=(65536-50000)%256;
  TR0=1;
  second=0;
  tcount=0;
  P0=dispcode[second/10];
  P2=dispcode[second%10];
  for(;;)
  {
    if(TF0==1)
     {  
       TF0=0;
	   tcount++;
	   if(tcount==20)
	      {tcount=0;
		    second++;
	        if(second==60)
	            second=0;
	        P0=dispcode[second/10];
            P2=dispcode[second%10];
	      }
     
     TH0=(65536-50000)/256;
     TL0=(65536-50000)%256; 
	 TF0=0; 
	 }
   }
  }