https://devzone.nordicsemi.com/f/nordic-q-a/61404/internal-swdio-and-swdclk-pull-up-downI know the question has been up before, but why does the data sheet say pull up/down ? isn&#39;t the signals always pulled up? or is there a scenario where the nrf52 would switch to a 13k pull-down!? ARM ref:en-USTelligent Community 13Fri, 15 May 2020 11:45:28 GMThttps://devzone.nordicsemi.com/thread/250162?ContentTypeID=1Fri, 15 May 2020 11:45:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d4de64b5-77f5-414b-ae03-b8519f3104c2haakonsh<p>It&#39;s should just state pull-ups. All pull resistors in the nRF52 series are 13k +/- 3k.</p><div style="clear:both;"></div>