I think Chris has nailed it.  This oupute described could easily
result from reading the ADRESH register twice.  The most likely
reason for this is failure to switch banks.  ADRESH and ADRESL
are at the same address; except one (ADRESH) is in bank 0 and
the other (ADRESL), is in bank1.

To use the lower eight bits, use:

        bsf     STATUS, RP0             ; switch to Bank1
        movf    ADRESL ^ 0x80, W
        bcf     STATUS, RP0             ; switch to Bank0

Then you'll have ADRESL in the w register.

Andrew



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---- On    , Chris Emerson (pic@NOSREME.ORG) wrote:

> On Fri, Jun 18, 2004 at 01:31:24PM -0700, dimov stefan wrote:
> >   But when I'm  changing the voltage gradually from 0V
> > to 5V the LCD shows only four values respectivly : 0,
> > 257, 514, 771.
> >   Where is the culprit?
>
> I bet there's a typo, and you're using ADRESH twice instead of
> ADRESH:ADRESL.   Those numbers in hex are 0x0000, 0x0101,
0x0202, and 0x0303,
> which look rather suspicious.
>
> Chris
>
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