void setup() {
  DDRC = 0xFF;
}

void loop() {
  PORTC = (1 << PC0) | (1 << PC1) | (1 << PC2) | (1 << PC3);
  delay(1000);
  PORTC = (0 << PC0) | (0 << PC1) | (0 << PC2) | (0 << PC3);
  delay(1000);

  PORTC = (1 << PC4) | (1 << PC5) | (1 << PC6) | (1 << PC7);
  delay(2000);
  PORTC = (0 << PC4) | (0 << PC5) | (0 << PC6) | (0 << PC7);
  delay(2000);
}