#define F_CPU 1000000UL
#define CLK PINB2
#include <avr/eeprom.h>
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>

ISR(EXT_INT0_vect)
{

PORTA|=_BV(PORTA1);
}
int main(void)
{
//init
cli();
DDRA=0b00000111;
PORTA=0x00;
DDRB=0x00;
PORTB=0b0001100;
// MCUCR|=_BV(1); //Setting INT0 to falling edge interrupt
MCUCR=1<<ISC01 | 1<<ISC00;
GIMSK=(1<<INT0); //enable INT0 interrupt
//endinit
sei();
	while(1)
	{
//		if (PINB&(1<<CLK))
  {
  PORTA|=_BV(PORTA0);
  PORTA&=~_BV(PORTA0);
  }
	}
}