Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG11B/EFM32GG11B510F2048GQ100/CRYPTO0/CMD#0x0
Command Register
Execute Instruction
Encryption/Decryption SEQUENCE Start
Sequence Stop
Sequence Step
https://github.com/cmsis-svd/cmsis-svd-data