On an ATmega2560, can ports have some pins used for analog inputs but others as digtial i/o? Specifically, I only need to use 3-5 analog inputs but have many digital inputs. I would like to use the remaining 3-5 pins as digital outputs if possible.
Additionally, does it make a difference if the port in question is Port F vs. Port K? For Port F, the datasheet seems to imply that all 8 of the pins are analog only if the ADC is enabled:
Port F serves as analog inputs to the A/D Converter.
Port F also serves as an 8-bit bi-directional I/O port, if the A/D Converter is not used.
For Port K, however, the datasheets port description does not have the distinction:
Port K serves as analog inputs to the A/D Converter.
Port K is a 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
It seems that this is definitely possible for the Arduino Uno/ATmega328P ADC port (except for the ADC6/7 pins for 32-pin form factors), but I can't seem to find anything confirming for the Arduino Mega/ATmega2560 or distinguishing between whether this is done on Port F or Port K
