#include <AT89X51.H> 

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66, 

                            0x6d,0x7d,0x07,0x7f,0x6f}; 

unsigned char Second; 

void delay1s(void) 

{ 

  unsigned char i,j,k; 

  for(k=100;k>0;k--) 

  for(i=20;i>0;i--) 

  for(j=248;j>0;j--); 

} 

void main(void) 

{ 

  Second=0; 

  P0=table[Second/10]; 

  P2=table[Second%10]; 

  while(1) 

    { 

      delay1s(); 

      Second++; 

      if(Second==60) 

        { 

          Second=0; 

        } 

      P0=table[Second/10]; 

      P2=table[Second%10]; 

    } 

}