Hi, im not an expert but i had always used analog pins with the Opamps.
Guessing you are using a 5LP, the AppNote AN58304 describes the pins that we must use for best performance, and give us a table 3, in page 7:
i hope somebody can elaborate a better answer
The term "Hardware Connection" for a pin (usually a digital pin) means that the pin is driven by an internal signal as opposed to driving the pin by software using a Pin_Read() or a Pin_Write() API.
Open the datasheet for the pin component and browse through the explanations for the parameters.