Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG11B/EFM32GG11B820F2048GL120/EMU/VMONBUVDDCTRL#0x0
VMON BUVDD Channel Control
Enable
Rise Wakeup
Fall Wakeup
Threshold Fine Adjust
Threshold Coarse Adjust
https://github.com/cmsis-svd/cmsis-svd-data