On the atmega328p when I set reference to internal I can read the voltage with a dmm on the aref pin.
On the attiny84 I cannot figure out how to output the internal ref. Looking at the data sheet it appears that the aref pin is muxed different to allow the pin to be used for different purposes. I have tried setting the REFS0 and REFS1 with no luck. The data sheet mentions it is possible to use internal ref with external capacitor at aref pin but I cannot figure it out.
Is there anyway to set the aref pin to aref while internal? Or it is just not possible on the attiny84 ?