#include "avr/io.h"
  int main ( )
  {
    ddra = 0xff;  
    ddrb = 0xff;  
    portd = 0xff;  
    while(1) 
    {
       tccr1a = 0;   
      tccr1b = 0x41;
      while ((tifr&(1<<icf1)) == 0);
      tifr = (1<<icf1);  
      porta = icr1l;    
      portb = icr1h;
    }
    return 0;
  }