Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B530F512GQ100/LEUART1/CMD#0x0
Command Register
Receiver Enable
Receiver Disable
Transmitter Enable
Transmitter Disable
Receiver Block Enable
Receiver Block Disable
Clear TX
Clear RX
https://github.com/cmsis-svd/cmsis-svd-data