Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG12P/EFR32FG12P431F1024IM48/CRYPTO1/DATA1BYTE#0x0
DATA1 Register Byte Access
Data 1 Byte Access
https://github.com/cmsis-svd/cmsis-svd-data