Silicon Laboratories EFR32xG14 Wireless Gecko Reference Manual page 606

Bit Name
0 RXPEN
When set, the RX/MISO pin of the USART is enabled.
Value
0
1
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USART - Universal Synchronous Asynchronous Receiver/Transmitter
Reset Access Description
0 RW RX Pin Enable
Description
The U(S)n_RX (MISO) pin is disabled
The U(S)n_RX (MISO) pin is enabled
Reference Manual
Rev. 1.1 | 606