Have I messed something?

<snip>
> Alexandre has said that the internal pull-ups are activated only when
> writing to the whole port, and not when manipulating individual
> bits.
</snip>

What?
Internal "pullups" on PORTB are for inputs - they pull up the signal. the
only open drain is RA4. These are set using OPTION_REG, bit 7, not by
writing to the PORT. Last I heard, PORTC was TTL........



>  From the documentation though, I can't seem to find any control
> bits for pull-up resistors for PORTC.
>
> So what i've done is initially written to the whole port, 0xFF.  Luckily
> I'm not using PORTC for anything else and seems to have fixed the
> problem.....  for now.

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