Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series0/EFM32LG/EFM32LG890F256/ETM/ETMTRIGGER#0x0
ETM Trigger Event Register
ETM Resource A
ETM Resource B
ETM Function
https://github.com/cmsis-svd/cmsis-svd-data