Hang on, here, I'm not going over a page boundary, just over a 256 word
boundary

 The 16F87x datasheet has this entry for GOTO

Syntax: [ label ] GOTO k
Operands: 0 =< k =< 2047
Operation: k -> PC<10:0>
PCLATH<4:3> -> PC<12:11>
Status Affected: None
Description: GOTO is an unconditional branch.
The eleven-bit immediate value is
loaded into PC bits <10:0>. The
upper bits of PC are loaded from
PCLATH<4:3>. GOTO is a twocycle
instruction.


I'm having a problem with bit 8 of the PC or, PCLATH <0>.  According to that
entry, PCLATH <2:0> adjust themselves when a goto or call is used.

Brendan

----- Original Message -----
From: "Dwayne Reid" <dwayner@PLANET.EON.NET>
To: <PICLIST@mitvma.mit.edu>
Sent: Wednesday, June 19, 2002 10:31 AM
Subject: Re: [PIC]: Wierd MPLAB SIM issue with PCLATH


>
> PCLATH does NOT change by itself!  *YOU* have to set it to point to the
> correct ROM segment.
>
> A very similar example was posted about a week ago.  Here it is again:
>
>            movwf   SAVE_ADDR       ; Save offset
>            movlw   high (table1)  ;set the high bits of the table entry
adr
>            movwf   pclath
>
>            movlw   low (table1)
>            addwf   SAVE_ADDR,W     ; find appropriate offset
>            skpnc                   ;wrap past end of current page?
>              incf  pclath,F        ;yep - point to next page
>            movwf   PCL             ;now go to correct entry in table
> table1                            ;start address of the table
>            retlw   B'01111110'     ; '0'
>            retlw   B'00110000'     ; '1'
>            .
>           .
>            .
>            nop                     ; Error - '15'
>            retlw   B'00000001'     ; Return dash
>
> dwayne
>
> --
> Dwayne Reid   <dwayner@planet.eon.net>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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