Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG12P/EFR32FG12P231F1024GM48/ETM/ETMPDSR#0x0
Device Power-down Status Register
ETM Powered Up
https://github.com/cmsis-svd/cmsis-svd-data