https://devzone.nordicsemi.com/f/nordic-q-a/66398/nrf52840-pwm-jitterI&#39;m designing a product around the nRF52840 (PAN1780 module), and using the PWM to drive a piezo sounder (using 2 pins as Hbridge). When I start using BLE functions, I get about 1% jitter on the PWM drive, which doesn&#39;t sound good. Any idea why? I thoughen-USTelligent Community 13Mon, 28 Sep 2020 08:00:35 GMThttps://devzone.nordicsemi.com/thread/271681?ContentTypeID=1Mon, 28 Sep 2020 08:00:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ba4fdb06-035e-4afc-a005-86dbceab6657benmack<p>Perfect, that has fixed it, thank you so much!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/271604?ContentTypeID=1Fri, 25 Sep 2020 21:11:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:11a6578d-544a-4b13-bfe4-a1bc77f247efDmitry<p>Hi,</p> <p>The chip works from internal RC oscillator if you didn&#39;t enable HFXO. When SoftDevice&nbsp;starts radio activity, it switches to HFXO - the frequencies are slightly different, that&#39;s why you see a jitter. To work from HFXO all the time, call sd_clock_hfclk_request().</p><div style="clear:both;"></div>