78. Sleep Modes Power Management

Which of the following statements is true? (After executing the code)

Code

#include <avr/sleep.h>  // Include library for sleep functions

// Function to disable Brown-Out Detection (BOD) and put MCU into Power-down Sleep Mode
void disableBODAndSleep() {
  cli();  // Disable global interrupts to avoid unintended execution during configuration

  sleep_enable();  // Enable sleep mode
 
  // Disable Brown-Out Detection (BOD) 
  MCUCR |= (1 << BODS) | (1 << BODSE);  // Set BODS and BODSE bits to enable BOD disable feature
  MCUCR &= ~(1 << BODSE);  // Clear BODSE within 4 clock cycles to disable BOD
 
  sei();  // Re-enable global interrupts to allow wake-up sources to function
 
  set_sleep_mode(SLEEP_MODE_PWR_DOWN);  // Set Power-down mode 
  sleep_mode();  // Put the MCU into sleep mode 

  sleep_disable();  // Disable sleep mode after waking up
}

void setup() {
  pinMode(2, INPUT_PULLUP);   
  attachInterrupt(digitalPinToInterrupt(2), wakeUp, FALLING);
}

void loop() {
  disableBODAndSleep();  // Put MCU into deep sleep, will wake up on external interrupt
}

// Interrupt Service Routine (ISR) to handle the wake-up event
void wakeUp() {
  // Empty ISR: Execution resumes after sleep_mode() when an interrupt occurs
}