I have used ATmega328 for several years now,
and now I bought an ATmega32U4.
I noticed a small phenomenon in ATmega32U4, that I did not see in ATmega328.
Please see this image:
Look for example on the leg called "4 / A6".
Does this mean that this leg is both a Digital Leg #4, and an Analog Leg #6?
If yes, why one leg is being a mix of two legs of the chip?
In ATmega328 for example, we have the "D" legs, and we have the "A" legs..
They are not mixed.
(I should note that in ATmega328, all Analog legs also have the ability of Digital legs in addition to being analog. but they do not get a double naming, like "D5 / A4" or something like that..)
Please help me..