Configuring Port A, Pin 4 as a general I/O pin in the PIC18F442

Hello World,

I'm using the PIC18F442 and I can't seem to configure Pin 4 of Port A
to be a normal I/O Pin.

I've tried to disable the T0CON register that also has functionality
on that pin and I still can't use the pin as a general I/O pin.

I need it for a project and I have already made the PCB board so that
pin has to work.  Can anyone help me?

Thanks a million.

<novak.arthur@gmail.com> wrote in message 
news:1172688692.909688.103610@h3g2000cwc.googlegroups.com...
> Hello World,
>
> I'm using the PIC18F442 and I can't seem to configure Pin 4 of Port A
> to be a normal I/O Pin.
>
> I've tried to disable the T0CON register that also has functionality
> on that pin and I still can't use the pin as a general I/O pin.
>
> I need it for a project and I have already made the PCB board so that
> pin has to work.  Can anyone help me?
>
> Thanks a million.
>

Port A pin 4 is an open drain pin.  It can be used as a general purpose 
input, but as an output it can only pull low.  If you need it as an output, 
high, then you need a pull-up.