Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B530F512GQ100/ETM/ETMPDSR#0x0
Device Power-down Status Register
ETM Powered Up
https://github.com/cmsis-svd/cmsis-svd-data