Code attached sorry bout FSR its nothing to do with it. Its (AN556)
computed goto crossing 256 bit page boundary. All messages up to and
including 33 are ok but when pcl >255 it starts reading from the wrong
place.
Steve

STRNUM is the message to be displayed
TABOFF is the pointer to the char to be returned
;------------------INCREMEMTS CHARTHER POINTER FOR TEXT STRING----------
POINT   MACRO

        INCF    TABOFF,F
        MOVFW   TABOFF
        ADDWF   PCL,F
        ENDM

Org 0800h
LAST    EQU     b'10000000'     ; SIGNIFIER FOR LAST CHAR

CALLSTR
        MOVFW   STRNUM  ; GET STRING
        ADDWF   PCL,1   ; WHICH STRING
        GOTO    MSG0    ; blah
          GOTO    MSG1  ; blah

        goto    MSG34           ; blah

; lots of text strings here

MSG34   POINT
        RETLW   'B'
        RETLW   'A'
        RETLW   'T'
        RETLW   'T'
        RETLW   'E' ;<this actual address 08ffh (returns ok)
        RETLW   'R' ;never gets here but returns from somewhere else
        RETLW   'Y'
        RETLW   ' '
        RETLW   'C'
        RETLW   'B'+LAST


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Jan-Erik Soderholm XA
(TN/PAC)
Sent: 02 January 2004 21:51
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: FSR and page boundry help needed (please)

Steve Smith wrote:

> Its an '877 and my text block starts at 0800h

OK, so it's table reads in program memory then. But then,
I dont see where the FSR reg comes into play...

> It's a big bunch of ascii for a display but I got loads a messages

What messages ?

> and about half way throu msg 34

I don't know what "msg 34" is.

> (address 08ff) it jumps to the wrong place
> middle of some previous message (PCL should be 256 for the computed
> jump) but I aint sure where bit 9 of the pointer is

What "pointer" ?

Well, definitly time to show some code...
A stripped down example that shows the problem
would be fine.

Jan-Erik.

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