Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32BG22C224F512GM32/USART0_S/TXDATAX#0x0
No Description
TX Data
Unblock RX After Transmission
Set TXTRI After Transmission
Transmit Data As Break
Clear TXEN After Transmission
Enable RX After Transmission
https://github.com/cmsis-svd/cmsis-svd-data