Well l am doing the same routine many times before this location with no
problems...l only have 1024k so l shouldnt be needing to page in a
16c84...thanks for the suggestions though l will try it but l dont think it
is the proiblem...

----- Original Message -----
From: "Martin Hill" <eaxmjhi@NOTTINGHAM.AC.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, September 23, 2000 12:14 AM
Subject: Re: [PIC]: Problem with PC in 16c84 / mplab ver 4.12 ??


> I have just had a similar problem, read application AN556, which
> explains how tables work, basically you must set all the upper bits
> of the PC register (PCLATH) as when you add to the PCL it will use
> these upper bits. So I think it should look more like:
>
> > LOCK_BEGIN
>                             MOVF      HIGH    LOCK_BEGIN,W
>                             MOVWF   PCLATH
>                               MOVF LOCK_STATE,W
> >                            ADDWF PC
> >                            GOTO LOCK_HALT
> >                            GOTO LOCK_WAIT
> >                            GOTO LOCK_TIMER
>
> Read the App Note, it explains it better than me.  If you don't set the
> bits you are probably jumping to an address at the start of the
> current 2k block of code.
>
>
> Martin
>
>
>
> > I have the following problem...when l add to the pc counter at about
144H it sends me to the wrong spot...
> >
> > now forgive me if l am wrong but isnt the 16cXXX series meant to fix
that jump bit stuff so that l dont have to set the page bits etc...??
> >
> > this is the code
> >
> > LOCK_BEGIN      MOVF LOCK_STATE,W
> >                            ADDWF PC
> >                            GOTO LOCK_HALT
> >                            GOTO LOCK_WAIT
> >                            GOTO LOCK_TIMER
> >
> > lock_state = 1 and it sends me back to god knows where...but always the
same spot...
> > l suspect MPLAB as it has many bugs...does anyone know what is
happening...it is quite urgent...thank you
> >
> > Paul Drummond
> > geniesys@alphalink.com.au
> >
> > --
> > http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> > use mailto:listserv@mitvma.mit.edu?body T%20PICList%20DIGEST
> >
> >
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST
>
>

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST