PortC

amjad_alahdal · Joined: 19 Feb 2013 Posts: 50

I'm using PIC18F2455. I need to use almost all pins. I'm having some problem with PORTC. I need them to be Digital I/O. How do I set the Port to be Digital I/O in the fuses line ??

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

They can't be output pins. They can be input pins, if you use the
method shown in the sample code in this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=48742

amjad_alahdal · Joined: 19 Feb 2013 Posts: 50

Sure ?
Because, I have tried to set some inputs and outputs. Some worked as outputs. It's just I can't use them all

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

I assumed you had already tested all the pins on PortC and found that
pins C4 and C5 don't work as digital pins after the PIC is powered up
initially. And then, they can only be programmed to be input-only pins.
That's what I'm talking about in my post (pins C4 and C5).

amjad_alahdal · Joined: 19 Feb 2013 Posts: 50

Ok thanks.
I will give it a try. Indeed, I need to use 4 pins as outputs and 3 as inputs. I'll modify the connection the way you said. And I'm going to use C4 and C5 as inputs and C6 as well. The rest will be outputs. I'll post the result.

Ttelmah · Joined: 11 Mar 2010 Posts: 19515

Seriously, just read the data sheet.....

If you look at table 1-2, and read what it says for each port pin here, it tells you exactly 'what' the chip's pins can do. Look at the 'pin type' column, against each pin.
So pin RC0, is listed as I/O, 'digital I/O', while pin RC4, is listed as I, 'digital input'. The manufacturer can't be much clearer than this....
The same for RC5.

You are not going to get very far in electronics, if you can't take a 'hint' as strong as this one!......

Best Wishes