Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series0/EZR32HG/EZR32HG220F64R61/RTC/SYNCBUSY#0x0
Synchronization Busy Register
CTRL Register Busy
COMP0 Register Busy
COMP1 Register Busy
https://github.com/cmsis-svd/cmsis-svd-data