void setup()
{
	DDRB = 0B00000001; //  PIN B0 pour la led
	
	EICRA |= (1 << ISC01);
 	EICRA |= (1 << ISC00);
	EIMSK |= (1 << INT0);
	
	sei();
}

void loop(){}

ISR (INT0_vect)
{
	PORTB ^= 0B00000001;
}