I am working on an application using ATmega328p atmel microcontroller. I started with the 28 PDIP version, but now I want to use the 32 TQFP, which I noticed has 2 extra inputs after compiling my Altium project.
These inputs are ADC7:6 which "serve as analog inputs to the A/D converter. These pins are powered from the analog supply and serve as 10-bit ADC channels," according to the datasheet.
I have read online that some people have got unknown results when they use the ADC and have floating inputs. What I read they've done is activate pull-down resistors, but I do not see how to configure them (since they do not belong to an I/O port). Also, my application does not even use the A/D converter at all.
What are the best practices? Should I connect an external pull-down resistor? Ignore Altium error?