Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series0/EFM32G/EFM32G200F64/CMU/AUXHFRCOCTRL#0x0
AUXHFRCO Control Register
AUXHFRCO Tuning Value
https://github.com/cmsis-svd/cmsis-svd-data