#define DDRB   // Define DDRB register
#define PORTB  // Define PORTB register

void setup() {
  // Set pin 13 (bit 7) on Port B as output
  DDRB |= (1 << 7);
}

void loop() {
  // Turn pin 13 on (HIGH)
  PORTB |= (1 << 7);
  delay(1000);  // Wait for 1 second

  // Turn pin 13 off (LOW)
  PORTB &= ~(1 << 7);  // Use bitwise AND with NOT to clear the bit
  delay(1000);  // Wait for 1 second
}