https://devzone.nordicsemi.com/f/nordic-q-a/13474/pwm-frequency-accuracyhello, I want to generate a square wave; examples of your company use PWM official offer;Square wave frequency lower accuracy, configuration 10KHz frequency, there will be error &#177; 16Hz.How do I need to configure the frequency accuracy can reach &#177; 1Hzen-USTelligent Community 13Fri, 06 May 2016 03:53:49 GMThttps://devzone.nordicsemi.com/thread/51413?ContentTypeID=1Fri, 06 May 2016 03:53:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4b74f515-b382-4bf1-af80-4df37380bc98jasonbu<p>Solved tks~</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/51412?ContentTypeID=1Thu, 28 Apr 2016 10:37:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1f01fe31-9da3-4190-9f78-6f5108888526Stian R&#248;ed Hafskjold<p>Do you have an external crystal on your board? If you have, you can start it by writing this in top of main():</p> <pre><code>NRF_CLOCK-&gt;TASKS_HFCLKSTART = 1; while(!NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED){} </code></pre> <p>You will not get the accuracy you want by using the internal RC oscillator, it has a typical accuracy of 1.5%: <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.0/clock.html?cp=1_3_0_17_3_0#unique_1900851505">infocenter.nordicsemi.com/.../clock.html</a></p><div style="clear:both;"></div>