WDT_DISABLE() stops the Watchdog.

void WDT_DISABLE()

void setup() {
#if defined(__AVR_ATmega2560__)
  WDT_ENABLE(WDT_2S);  // Set the watchdog timeout and start operation.
#elif defined(__AVR_ATmega128__)
  WDT_ENABLE(WDT_1800MS);  // Set the watchdog timeout and start operation.
#endif
}
 
void loop() {
  const bool maintenanceMode = IdigitalRead(0, 5);  // Read the input repeatedly and update only if all samples match. If HIGH and LOW are mixed, retain the previous stable state.
  if (maintenanceMode) {
    WDT_DISABLE();  // Stop the watchdog.
    return;
  }
  WDT();  // Refresh the watchdog before its timeout expires.
}

• Use time constants supported by the MCU.
• Do not set a timeout shorter than the longest normal processing time.
• Do not hide program faults by placing WDT() where it always executes unconditionally.

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