Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG12P/EFR32FG12P432F1024GM48/ETM/ETMCNTRLDVR1#0x0
Counter Reload Value
Free running counter reload value
https://github.com/cmsis-svd/cmsis-svd-data