here is that code fragment. Not the mose efficent way, etc. but a way.
Anyway. replacing the 'clrc' with 'nop' caused it to not work - hence I
inserted the clrc bits. And I did try with nops just to make sure about
paging issues weren't clouding the issue, etc.

Doing a similar thing, but adding a negative number rather than subtracting
a positive one, worked okay.

The program measures a voltage on the A2D and makes a decision based upon
which window it lands in.


    clrc

    movlw .143                  ; 2.25V input threshold
    subwf ADRESH,w
    skpc
    goto result_c                ; = below 2.25v

    clrc

    movlw .175                  ; 2.75V input threshold
    subwf ADRESH,w
    skpc
    goto result_b                  ; = between 2.25v and 2.75v, i.e. 2.5
Volts

    clrc

    movlw .207                    ; 3.25V input threshold
    subwf ADRESH,w
    skpc
    goto result_a                  ; = between 2.75v and 3.25v, i.e. 3.0
Volts




----- Original Message -----
From: "David Cary" <dcary@BRUNSWICKOUTDOOR.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, May 18, 2001 5:39 PM
Subject: Re: [EE]: carry result: Robin Abbott


> Bob Ammerman <RAMMERMAN@PRODIGY.NET> on 2001-05-18 08:57:36 AM claimed
> >The value of carry at the start of the SUBWF instruction isn't applicable
at
> >all!
> >
> >The SUBWF instruction _always_ either sets or clears carry. It _never_
> >leaves carry unchanged.
>
> Yes, that's what all the data sheets say.
>
> Kevin, would you mind giving us some code that demonstrates your PIC
acting
> wierd ? That would make it easier for us to confirm it.
>
> --
> David Cary
>
> --
> http://www.piclist.com hint: The list server can filter out subtopics
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>
>
>
>

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