https://devzone.nordicsemi.com/f/nordic-q-a/127598/garbled-output-from-uart0Hi there, In a custom developed board based off of MDBT53-1M, I am struggling with the serial communication using UART0 pins. Using the default settings, I have been successful in receiving the output in an MDBT dev kit but I am not able to replicateen-USTelligent Community 13Fri, 27 Mar 2026 08:41:55 GMThttps://devzone.nordicsemi.com/thread/564149?ContentTypeID=1Fri, 27 Mar 2026 08:41:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b16fd201-8110-49e9-b8fd-b7b9ca8e0cb3Priyanka<p>Glad to hear that it works. Closing the ticket if no further doubts.</p> <p>-Priyanka</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/564128?ContentTypeID=1Thu, 26 Mar 2026 19:15:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:43e5962f-b2fe-450e-b78f-01fa4f3371b5umer<p>I got it to work!</p> <p></p> <p>It turns out that MDBT modules have an internal oscillator and if there is no external oscillator provided in your PCB, you must use the following configuration options in prj.conf so that the device does not look for an external oscillator:<br /><br /><pre class="ui-code" data-mode="text">CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y </pre></p> <p>This and make sure that uart0 is enabled explicitly according to your specific pinout.&nbsp;</p><div style="clear:both;"></div>