Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32BG13P/EFR32BG13P732F512GM48/ETM/ETMITATBCTR2#0x0
ETM Integration Test ATB Control 2 Register
ATREADY Input Value
https://github.com/cmsis-svd/cmsis-svd-data