> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of PICdude
> Sent: 13 December 2009 14:01
> To: piclist@mit.edu
> Subject: Re: [PIC] increase pic program flash memory size ? possible ?
> 
> I've thought about this for adding a user-configuration section to an
> existing product, which didn't have enough extra code space in it...
> 
> My thought was that since this would expectedly be used on a "handful"
> of times, I could have the extra code in external memory waiting like
> a DLL, then load that into the PIC when needed, temporarily
> overwriting some other code that's not needed during normal operation
> (like some 32-bit math routines).  That math code would also be in
> external memory and re-loaded when the configuration section was
> complete.
> 
> I haven't worked out the full details, but then I discovered the
> 16F1936, giving me more code space (over the 16F883).

This sounds more like the overlays that some old DOS programs used
rather than a DLL.  This would be feasible for very rarely used
functions, but flash memory wear and erase/programming times may well be
a problem for anything else. 

You would probably have to allocate a block of RAM that would be used
only by the paged code and you would have to handle any initialisation
of this memory yourself.

Regards

Mike

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