#include <p18f4580.h>
void ToTime(unsigned char);
void main()
  {
    unsigned char sec;
	TRISB=TRISD=0;			
    T0CON=0x68;				
   	TMR0L=-60;				
    while(1)
      {
       do
        {
          T0CONbits.TMR0ON=1;	
          sec=TMR0L;
          ToTime(sec); 
        }
    while(INTCONbits.TMR0IF==0);	
    T0CONbits.TMR0ON=0;		
    INTCONbits.TMR0IF=0;		
      }
  }
void ToTime(unsigned char value)
  {
    unsigned char sec, min;
    min = value / 60;
    sec = value % 60;
    PORTB = sec;
    PORTD = min;
  }