I figured it out.  I'm using CCS compiler.  The #rom 0x1800 =
{1234,34,34,654,549}
does it just fine.

Thanks for the input.

Jim

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of John J. McDonough
Sent: Thursday, February 26, 2004 10:14
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC:] Can I put values into a block of program memory at
design time?


The path of least resistance is to store a string of RETLW's, but that costs
one word per byte.  You can define a bunch of them with a dt directive.  You
can get it back via an index with the old ADDWF PCL,F.  Sort of homely, but
it is simple.

f'rinstance:

sub     addwf   pcl,f
      dt 0x0,0x3,0x6,0x9,0xc,0xf,0x12

    movlw  D'2'   ; get number
    call   sub    ; multiply by three

sub will return with the corresponding literal in W.  The catch is the table
needs to be in the first page, or with a little dancing around, in an even
numbered page, which limits the size of the table somewhat.

Can you fit it in EEPROM?  Might be a little nicer.

--McD

----- Original Message -----
From: "Jim Monteith" <jimm@SERVICEMATE.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, February 26, 2004 10:58 AM
Subject: [PIC:] Can I put values into a block of program memory at design
time?


> Hi All,
>
> I'm working with an 16f877.  I would like to store data in upper program
> memory.  This data when be read and transmitted by the chip.
>
> What I'm looking for is a way to assign this data to memory locations at
> design time.  The data is too large to put in an array.  It exceeds the
> capacity of the RAM.  It has to go in ROM.
>
> I'll basically be using the unused program memory as an eeprom, but I'd
like
> to have the data already there when the chip starts up, and not have to
> write it to memory once it is running.
>
> Thanks for any ideas,
>
> Jim Monteith
>
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