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

ISR(INT0_vect)
{
	PORTB|=(1<<7);
	_delay_ms(100);
	PORTB&=~(1<<7);	
}


int main (void)
{
	DDRA=0xff;
	DDRB |=(1<<PB7);// LED output enable
	PORTD |=_BV(PD0);  // pin int0 PD0 pullup
	EIMSK |= (1<<INT0);    // enable interrupt
	EICRA |= _BV(ISC01)|_BV(ISC00); //falling edge activate INT0
	sei();
	while (100000000){
		PORTA=0x00;
		for (unsigned char i=0;i<8;i++)
		{
			PORTA = ~(1<<i);
			_delay_ms(1000);
		}

	}
}