Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Keil/AT32F423xx_v2/CRM/MISC2#0x0
Miscellaneous register2
AUTO_STEP_EN
USB division
HICK as system clock frequency division
HEXT as system clock frequency division
https://github.com/cmsis-svd/cmsis-svd-data