Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Keil/AT32F402xx_v2/CRM/MISC1#0x0
Miscellaneous register1
HICKCAL write key value
HICK 6 divider selection
HICK to system clock
Clock output select2
Clock output division2
https://github.com/cmsis-svd/cmsis-svd-data