https://devzone.nordicsemi.com/f/nordic-q-a/64560/fixed-clock-source-for-timerHello, Is it possible to set the clock source for a timer to the RC oscillator? I&#39;m using Bluetooth in combination with my timer and I see that it is counting differently when the softdevice switches over from RC to XTAL for BLE stuff. Normallyen-USTelligent Community 13Fri, 07 Aug 2020 06:33:45 GMThttps://devzone.nordicsemi.com/thread/263521?ContentTypeID=1Fri, 07 Aug 2020 06:33:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5dca33cc-6575-4a2d-bea9-90e1e323f60cT IJ<p>Thanks, the RTC isn&#39;t fast enough for my purpose.</p> <p>I&#39;ll have to find a different technique then.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/263479?ContentTypeID=1Thu, 06 Aug 2020 15:06:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d6c89cc3-f8aa-4015-9614-dc27af665a7dDmitry<p>Hi,</p> <p>no, the chip has only one HFCLK controller clocked either from HFINT or HFXO. You can force HFXO to run all the time with&nbsp;sd_clock_hfclk_request() function (this will increase current consumption somewhat). If 30.5 usec resolution is sufficient for you, it&#39;s better to use RTC clocked from LFCLK instead of timer.</p><div style="clear:both;"></div>