#include <avr/io.h>
#include <avr/interrupt.h>
#define F_CPU 16000000UL

void initTimer(void)
{
  /*OCR0A = 0;*/
  //TCCR0A = (1<<COM0A1); //Non-inverting mode
  //TCCR0B = (1<<CS02) | (1<<CS00); //1024 prescaler
  TIMSK0 = (1<<TOIE0); //Overflow interrupt
}

ISR(TIMER0_OVF_vect)
{
  int cnt = 0;
  cnt++;
  if (cnt == 255)
  {
    cnt = 0;
    //TCCR0A ^= (1<<WGM01) | (1<<WGM00);
    if (cnt < 9)
    {
      PORTD ^= 0xFF;
    }
  }
  
  TCNT0 = 65223;
}

int main()
{
  DDRD = 0xFF;
  //TCNT1 = 65223;
  //PORTD = 255;

  initTimer();
  while(1)
  {

  }
}