LED auf Mikrocontroller blinken lassen

[Sisor]

#define PORTE  0b00000000
#define DDRE   0b00010000
int main(void) {
  while(1) {
    PORTE |= DDRE;
    _delay_ms(500);
    PORTE &= DDRE;
    _delay_ms(500);
  }
}

oder:

#define PORTE  0b00000000
#define DDRE   0b00010000
int main(void) {
  while(1) {
    PORTE ^= DDRE;
    _delay_ms(500);
  }
}