Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32PG1B/EFM32PG1B200F256GM48/RTCC/RET24_REG#0x0
Retention Register
General Purpose Retention Register
https://github.com/cmsis-svd/cmsis-svd-data