Coming form AVR to STM32 F7 46, can I select voltage reference for ADC. Like in AVR, I could choose AVDD or VREF.
If I connect 2.5V to the VREF and 3.3 to AVDD, then what is the range of ADC measurement?
1) Is ADC range from 0V to 2.5V?
2) Or is 2.5V used to calibrate ADC reference (AVDD) and then range will be from 0V to 3.3V (=calibrated AVDD)?
In AVR 1) is correct. How about here?