Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32MG12P/EFR32MG12P433F1024IM48/ETM/ETMCLAIMSET#0x0
ETM Claim Tag Set Register
Tag Bits
https://github.com/cmsis-svd/cmsis-svd-data