https://devzone.nordicsemi.com/f/nordic-q-a/125150/uart-configuration-in-nrf52840Hello Team, We are currently building a circuit using nRF52840 CKAA (WLCSP -94) .We have configured P1.03 &amp; P1.05 GPIO pins as UART_TX &amp; RX . Kindly confirm if this pin or any GPIO can be configured as UART TX &amp; RX Thanks &amp; Regards, Jhakan.Men-USTelligent Community 13Thu, 23 Oct 2025 09:06:45 GMThttps://devzone.nordicsemi.com/thread/552220?ContentTypeID=1Thu, 23 Oct 2025 09:06:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e5404af9-3719-446e-97df-94b340dff825Ressa<p>Hi,<br /><br />Thanks for contacting us. Yes you can use them for UART TX and RX, just please note that the IOs are for low frequency signals only. It means that if you are going to have bit rate of more than 10k then it will not work reliably. For high speed signaling it is recommended to avoid using the IOs that are labeled as &quot;<span>Standard drive, low frequency I/O only&quot;. You can find the details of each pin on pin assignment page:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ps_nrf52840/page/pin.html">Pin assignments</a></span><br /><br /><br /><img style="max-height:244px;max-width:611px;" height="244" src="https://devzone.nordicsemi.com/resized-image/__size/1222x488/__key/communityserver-discussions-components-files/4/pastedimage1761210196240v1.png" width="611" alt=" " /><br /><br /><br /><img style="max-height:127px;max-width:565px;" height="127" src="https://devzone.nordicsemi.com/resized-image/__size/1130x254/__key/communityserver-discussions-components-files/4/pastedimage1761210224084v3.png" width="565" alt=" " /><br /><br /><br />Best regards,<br />Ressa<br /><br /><br /></p><div style="clear:both;"></div>