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Serial Port 3

Hi

thank you very much for your paying attention.

Yes the peripherial_uart sample seems to be a good choice for my project. But Uart 0 pins didn't come out on GPIO connector 

pins in NRF5340-DK development board. Can I use Uart 1 instead of Uart 0 in the peripherial_uart sample and if it is possible what is 

the logic level I should use 5v or 3.3v?

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