Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32MG12P/EFR32MG12P132F1024GL125/CMU/HFEXPPRESC#0x0
PRESC=NODIVISION
High Frequency Export Clock Prescaler Register
HFEXPCLK Prescaler
0 (NODIVISION): undefined
https://github.com/cmsis-svd/cmsis-svd-data