Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG11B/EFM32GG11B520F2048GL120/CRYOTIMER/PERIODSEL#0x0
Interrupt Duration
Interrupts/Wakeup Events Period Setting
https://github.com/cmsis-svd/cmsis-svd-data