https://devzone.nordicsemi.com/f/nordic-q-a/31152/nrf52840-swdio-internal-pullup-and-swdclk-internal-pulldown-valuesHi, The datasheet for the nRF52840 says that the SWDIO and SWDCLK lines have internal pullup and pulldown resistors already, and thus, does not need external ones. Two questions: 1. Is it really ok to use the internal resistors as is, or shoulden-USTelligent Community 13Tue, 06 Mar 2018 11:42:19 GMThttps://devzone.nordicsemi.com/thread/123038?ContentTypeID=1Tue, 06 Mar 2018 11:42:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c9a7e46b-d7dd-4f0f-adab-8f7e8a2923d1FormerMember<ol> <li>No, on the nRF52840, there is no need for external pull-up/pull-down resistors on SWDCLK and SWDIO for programming the chip.</li> <li>300 kΩ+ sounds like too much. How did you do the measurements?</li> </ol><div style="clear:both;"></div>