https://devzone.nordicsemi.com/f/nordic-q-a/6026/timer1-only-firing-at-250hzNot sure why but my time is only firing at 250Hz with the prescaler set to 0. Not sure why. Shouldn&#39;t it be going at 16Mhz at these settings? (Running on the PCA10028 Board) namespace drv { void Timer::Init() { // Start 16 MHz crystal oscillatoren-USTelligent Community 13Fri, 13 Mar 2015 10:36:16 GMThttps://devzone.nordicsemi.com/thread/21066?ContentTypeID=1Fri, 13 Mar 2015 10:36:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c95b4695-f0b1-43d3-8ac6-a179fe0909cbStian R&#248;ed Hafskjold<p>Thank you for answering your own question!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/21065?ContentTypeID=1Thu, 12 Mar 2015 20:10:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0c073994-0796-48b1-a238-31b65496b4acmbush91<p>Figured it out!</p> <p>Needed to set the TASKS_CLEAR bit. Hope this helps somebody else!</p> <pre><code>void TIMER1_IRQHandler() { NRF_TIMER1-&gt;TASKS_CLEAR = 1; nrf_gpio_pin_toggle(21); svc::TimerManager::IncrementTime(); NRF_TIMER1-&gt;EVENTS_COMPARE[0] = 0; // Clear INT } </code></pre><div style="clear:both;"></div>