So, the ATMEGA644-20PU would work fine,
Don't forget that the 644P has two UARTs and the 644 only one.
This may not matter in your current application but it
could be useful in the future.
I learned this suffix lesson the hard war 
(* jcl *)
So, the ATMEGA644-20PU would work fine,
Don't forget that the 644P has two UARTs and the 644 only one.
This may not matter in your current application but it
could be useful in the future.
I learned this suffix lesson the hard war
(* jcl *)