At 09:58 AM 2/26/2004 -0600, you wrote:
>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

Sure, it's not a problem. RTFM, DS33014G, specifically, section 5.1x

You can even pack two 7 bit ASCII characters per 14-bit program word.

If you do this on a product, and you have to write to program memory
during operation, I suggest partitioning your ROM and write-
protecting all the portion that has your code in it. Doing otherwise causes
a certain amount of clench factor, IMHO.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads