# MCU analog reference voltage and Voh question

If I feed 2.5v to Vref pin on a MCU runs on 3.3v, what is the voltage for Voh?

I though Voh would be around 2.5v but I found the following table for the MCU(http://www.st.com/content/ccc/resource/technical/document/datasheet/03/b4/b2/36/4c/72/49/29/DM00071990.pdf/files/DM00071990.pdf/jcr:content/translations/en.DM00071990.pdf)

looks like Voh has nothing to do with Vref, so I am confused.

• why do you think it should do anything with Vref? Vref is for ADC. Vohis a parameter of the digital pins. – Eugene Sh. Aug 16 '17 at 17:16