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

ISR(TIMER0_OVF_vect) {
    // XOR PORTA with 0x01 to toggle the second bit up
  PORTA=PORTA ^ 0x04;
	TCNT0=256-78;
  
}

int main( void ) {
DDRA = 0xFF; 			// Configure PORTA as output
PORTA = 0xFF;
TIMSK1 |= (1<<TOIE1);		// enable timer overflow interrupt for Timer1

TCNT0=256-78;
TIFR1 |= (1<<TOV1);

TCCR1B = (1 << CS10) | (1 << CS12); 	// turn on 16 bit timer1 also with /1024
sei(); 					// enable the global interrupts
while(1) {
    }
}