https://devzone.nordicsemi.com/f/nordic-q-a/60897/starting-the-timer-without-bleSituation: SES, SDK 16, nRF52832 I&#39;m developing a pre-production test program without BLE. I&#39;m using APP_TIMER_V2 and noticed that the timer events do not not happen even after following the BLE example code. It turns out there&#39;s some legacy calls inen-USTelligent Community 13Mon, 04 May 2020 12:22:48 GMThttps://devzone.nordicsemi.com/thread/247860?ContentTypeID=1Mon, 04 May 2020 12:22:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bc3437df-031c-468e-8a3d-d2514f7031b6J&#248;rgen Holmefjord<p>Hi,</p> <p>This is not &quot;hidden&quot; in the BLE startup, but it is just a consequence of the softdevice keeping the low frequency clock active at all times whenever it is enabled (in order to wakeup at specific intervals to handle tasks).</p> <p>RTC/app_timer also requires the LFCLK to be running, this is described in the <a href="https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/application-timer-tutorial">application timer tutorial</a>.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>