nRF54L15: UART pinout not working unless connecting the RTT viewer

Hi everyone,

I am working with the new nRF54L15 and have connected UART21 to pins 2.07-2.10, which are capable of handling both Trace data and UARTE. However, I am encountering an unusual behavior with the UART RXD pin.

When I attempt to use the UART RXD pin, it only works fine when either:

  • The JLINK is connected via SWD
  • The RTT Viewer is connected

If neither of the above tools are connected, I am unable to use the UART RXD at all.

Has anyone else experienced a similar issue with the nRF54L15? Any ideas on what might be causing this behavior or suggestions on how to resolve it would be greatly appreciated.

Thank you in advance for your help!


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