https://devzone.nordicsemi.com/f/nordic-q-a/93953/pin-connection-of-second-uart-interface-with-nrf52840There are two UART interfaces in nRF52840: We have refer to nRF52840 and nRF52840 DK materials, but we found only one UART connection reference. We want to know how to connect the second UART because there is no other reference material with us. en-USTelligent Community 13Thu, 17 Nov 2022 08:24:24 GMThttps://devzone.nordicsemi.com/thread/396127?ContentTypeID=1Thu, 17 Nov 2022 08:24:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:98d7e00a-e077-4112-94c1-bb2b2d538dfcVidar Berg<p>Hello,</p> <p>The SDK has not assigned any default pins for the UARTE1 instance, so you can just select some GPIOs that are available on your board. You should however avoid using the pins recommended for low frequency operation:</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1668673251283v1.png" alt=" " /></p> <p>(ref. <span><a title="Pin assignments" href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/pin.html?cp=4_0_0_6_0">Pin assignments</a> </span>and UARTE <span><a title="Pin configuration" href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/uarte.html?cp=4_0_0_5_33_7#concept_wmv_f2m_wr">Pin configuration</a></span>)</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>