volatile int count =0 0;

ISR(TIMER1_COMPA_vect)
{
  digitalWrite(8, bitRead(count, 0));
  digitalWrite(9, bitRead(count, 1));
  digitalWrite(10, bitRead(count, 2));
  digitalWrite(11, bitRead(count, 3));

  count++;

  if(count > 15)
  {
    count = 0;
  }
}

void setup()
{
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);

  noInterrupts();

  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1 = 0;

  OCR1A = 15624;

  TCCR1B |= (1 << WGM12);

  TCCR1B |= (1 << CS12) | (1 << CS10);

  TIMSK1 |= (1 << OCIE1A);

  interrupts();
}

void loop()
{
}