PIC16F688 RA0 & RA1 as input

[M14]

For some reason i cannot use RA0 and RA1 as input. These pins are also the program pins, does that has something to do with it?

For the record:

Code: Select all

TRISA = 0x03; // RA0 & RA1 are input
ANSEL = 0; // All inputs are digital

[lukes]

Hello,

Have you ever checked the Diagram ?
Maybe you should try to turn off the comparators (C1IN C1Out)

[M14]

FML ... Comparator module is on by default ...

[filip]

Hi,

Yes, you should disable comparators to use them as a digital I/O.

Regards,
Filip.

[M14]

I noticed before with other Microchip controllers that the analog inputs are configured instead of digital I/O by default. With the PIC16F688 the analog inputs are not configured by default, but the comparators are. I think this is very confusing, should there be any reason for Microchip to design it like this? Not your or MikroE's fault offcourse .

[filip]

Hi,

Well, it is something that we are all facing when developing our projects.
There is no other solution than reading the datasheet.

Regards
Filip.