#include <avr/io.h>
#include <avr/interrupt.h>

#define F_CPU 1000000UL
#include <util/delay.h>

#define PortSig 	PORTD
#define DDRSig		DDRD	
#define PortSpalt 	PORTB
#define DDRSpalt	DDRB


volatile uint8_t valspa=0xff;

ISR(INT0_vect)
{
	valspa=0xff;
}


int main(void)
{	
	DDRSig = 0b00000100;
	DDRSpalt = 0xff;
	
	GICR = 1<<INT0;
	MCUCR = 1<<ISC01 | 11<<ISC00;
	sei();
	while(1) 
	{
		PortSpalt = valspa;
		cli();
		_delay_ms(1000);
		sei();
		valspa=0x00;
		PortSpalt = valspa;
	}
	return 0;
}