Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG11B/EFM32GG11B520F2048IL120/LETIMER1/CMD#0x0
Command Register
Start LETIMER
Stop LETIMER
Clear LETIMER
Clear Toggle Output 0
Clear Toggle Output 1
https://github.com/cmsis-svd/cmsis-svd-data