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about vref of STM8L052C6

Question asked by Ram on Jun 17, 2015

I am using STM8L052C6(48 PIN)IC.
I have enabled VREFINT on pin no 41(PORT D6) and I am getting 1.22v on that pin.
Can I use this 1.22V on (Pin no. 12) Vref+ Pin as a Refernce Voltage for adc?
OR else I have to give external voltage for vref.

when I connect VREFINT  pin no 41(PORT D6) to (Pin no. 12) Vref+ pin this voltage gets drop to 0.8 volt.

and what should be the minimum adc reference voltage(Vref+)?