/*
 * GccApplication2.c
 *
 * Created: 27/11/2014 14:36:13
 *  Author: Callum
 */


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

char contents = 0xAA;

int main(void)
{
	DDRA = 0xFF;
	DDRD = 0x00;
	EICRA = 0x01;
	EIMSK = 0x01;
	PORTA = contents;
	sei();
    while(1)
    {
        //TODO:: Please write your application code
    }
}

ISR(INT0_vect) {
	contents = ~contents;
	PORTA = contents;
}