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

SIGNAL(SIG_INTERRUPT0){
PORTD ^= (1 << PD6);
myDelay(3);
}

int main(void){
        //set interrupt enable
        sei();
        //SET OUTPUT PINS
        DDRA |= (1 << PA0);
        DDRD = 0x78;
        while (1) {
        }
        return 0;
}