Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32BG22C222F352GN32/SMU_S/ESAUMRB01#0x0
Specify the boundary between regions 0 and 1.
Moveable Region Boundary 0-1
https://github.com/cmsis-svd/cmsis-svd-data