Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32BG22C224F512GM32/USART0_S/RXDOUBLEX#0x0
No Description
RX Data 0
Data Parity Error 0
Data Framing Error 0
RX Data 1
Data Parity Error 1
Data Framing Error 1
https://github.com/cmsis-svd/cmsis-svd-data