Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f3/STM32F301/ADC/CRR#0x0
ADC common control register
ADC clock mode
VREFINT enable
Temperature sensor enable
VBATEN
https://github.com/modm-io/cmsis-svd-stm32