#include "avr/io.h"
int main ( )
{
	unsigned char t1;
	DDRB = 0xFF;		
	PORTD = 0xFF;	
	TCCR1A = 0;		
	TCCR1B = 0x42;	
	while ((TIFR&(1<<ICF1)) == 0);
	t1 = ICR1L;
	TIFR = (1<<ICF1);	
	TCCR1B = 0x02;	
	while ((TIFR&(1<<ICF1)) == 0);
	PORTB = ICR1L - t1;	
	TIFR = (1<<ICF1);	
	while (1);		
	return 0;
}