Hello,
In the nRF52840 Product Specification PDF v1.11, on page 836, the second paragraph down states:
"The PSEL.RXD, PSEL.CTS, PSEL.RTS, and PSEL.TXD registers and their configurations are only used as long as the UARTE is enabled, and retained only for the duration the device is in ON mode."
and then follows with another sentence that states:
"PSEL.RXD, PSEL.RTS, PSEL.RTS, and PSEL.TXD must only be configured when the UARTE is disabled."
In the second paragraph, it states the PSEL.RTS twice, I think this might be a typo? Because it also omits the PSEL.CTS, from that second sentence.
References:
https://docs-be.nordicsemi.com/bundle/ps_nrf52840/attach/nRF52840_PS_v1.11.pdf?_LANG=enus
