Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series0/EZR32HG/EZR32HG220F64R55/EMU/CTRL#0x0
Control Register
Energy Mode Voltage Regulator Control
Energy Mode 2 Block
Energy Mode 4 Control
https://github.com/cmsis-svd/cmsis-svd-data