Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG1V/EFR32FG1V131F128GM32/CRYOTIMER/IFS#0x0
Interrupt Flag Set Register
Set PERIOD Interrupt Flag
https://github.com/cmsis-svd/cmsis-svd-data