Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG11B/EFM32GG11B110F2048GQ64/CMU/CMD#0x0
Command Register
Calibration Start
Calibration Stop
HFXO Peak Detection Start
https://github.com/cmsis-svd/cmsis-svd-data