#include <reg51.h>
void ToTime(unsigned char);
void main()
  {
    unsigned char val;
    T0=1;
    TMOD=0x06;			
    TH0=-60;			
    while(1)
      {
       do
        {
          TR0=1;
          sec=TL0;
          ToTime(val); 
        }
       while(TF0==0);
       TR0=0;
       TF0=0;
      }
  }
void ToTime(unsigned char val)
  {
    unsigned char sec, min;
    min = value / 60;
    sec = value % 60;
    P1 = sec;
    P2 = min;
  }