How to set internal and external ADC reference voltage of STM32F030C8 controller

Hello All,

We are designing battery operated device, for this we need to monitor battery voltage continuously using ADC pin of STM32F030C8 controller.

Question:

1) What is the Internal ADC reference voltage of STM32F030C8?

2) How to configure internal reference voltage for ADC, is this configuration is from hardware or firmware side?

3) We have provided fixed external +3.3V at VDDA pin, does this matter if we configure internal reference voltage?

Thank you

Shashikant

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