I have been searching every nook and cranny of the Atmel site and I can't figure out what the "a" means.
First there was the atmega644
Then they changed to atmega644p and atmega644v
Now they have the atmega644pa and atmega644a
I think I read somewhere that the "p" stands for picopower, but I have know idea what the "a" stands for.
Does anyone know what the "a" stands for and also where you can find this info?