void setup() {
  DDRD |= 0b11111100;
}

void loop() {
  PORTD |= bit(PD7) | bit (PD6) | bit(PD5) | bit(PD4) | bit(PD3) | bit(PD2);
  delay(1000);
  PORTD &= ~(bit(PD7) | bit (PD6) | bit(PD5) | bit(PD4) | bit(PD3) | bit(PD2));
  delay(1000);
}