This is my first time using a microcontroller, so please forgive me for
asking such a rudimentary question.

 

I would like to use the PIC16F684. It has 8 ADC channels and two
comparators.

 

Let's say a pin has three functions: digital I/O, ADC, and a comparator
input. As an example, pin 9 on the PIC16F684 can be used for RC1, AN5,
or C2IN-. Here is my question: can pin 9 do double-duty as an analog
input (AN5) *and* as the inverting input to comparator C2 (C2IN-)
*without* rewriting the initialization registers?

 

In other words, let's say one line of code reads the analog input
voltage on pin 9. Can the next line of code read the state of comparator
C2? Or do pins need to be configured to be an analog input, comparator,
but not both?

 

Thanks

 

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