https://devzone.nordicsemi.com/f/nordic-q-a/39060/nrf52840-timer2-capture-and-compare-question1.I used Timer2 Capture function Time Frequency is 1MHz. Picture1 Current counter should be 33330. Picture2 Current counter should be 5000. Picture3 Current counter should be 665. But the counter is smaller, Can you tell me? 2.I used Timer2 Compare functionen-USTelligent Community 13Tue, 02 Oct 2018 03:14:21 GMThttps://devzone.nordicsemi.com/thread/151094?ContentTypeID=1Tue, 02 Oct 2018 03:14:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a51328c-1070-4739-946e-6607cb13208bRay Chiou<p>Thank you.<br /><br />I used&nbsp;<span>sd_clock_hfclk_request() is OK.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/150938?ContentTypeID=1Mon, 01 Oct 2018 11:25:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3fc61dd4-7520-4d75-b449-60ce0e33e33fKenneth<p>Hi,</p> <p>Have you started the external hfclk here?</p> <p>For instance if you are not using a softdevice you can call NRF_CLOCK-&gt;TASKS_HFCLKSTART = 1, ref:<br /><a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/clock.html?cp=2_0_0_4_3_2#topic">http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/clock.html?cp=2_0_0_4_3_2#topic</a>&nbsp;</p> <p>If you are using a softdevice you should call&nbsp;<span>sd_clock_hfclk_request() instead.</span></p> <p>Best regards,<br />Kenneth</p><div style="clear:both;"></div>