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Interrupt Request (IRQ) not getting executed

Hello

I am using Seggar Embedded Studio for ARM V3.4 and nRF_SDK 12.3.0. I am trying to understand interrupts and interrupt handlers.

The interrupt request for Watchdog timer (i.e. void WDT_IRQHandler(void)) is not getting executed. The control is not going to WDT_IRQHandler.

Please let me know how can I achieve it.

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/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
*
* The information contained herein is property of Nordic Semiconductor ASA.
* Terms and conditions of usage are described in detail in NORDIC
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
*
* Licensees are granted free, non-transferable use of the information. NO
* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
* the file.
*
*/
/* This example shows functionality of the Watchdog. The watchdog will reset the IC every 3 seconds if
* it is not reloaded by pressing Button 1. LED 2 will blink during startup, which indicates that the
* watchdog has restarted the IC.
*/
#include <stdbool.h>
#include "nrf.h"
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
sdk_config.h

Any help is appreciable.