Another good suggestion!  I will look into this too.

Thanks,

- Ted


-----Original Message-----
From: Ishaan Dalal [mailto:izx@XIZX.NET]
Sent: Monday, July 21, 2003 10:08 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: Out of ROM PIC18F452 ....what do to?


You might want to use an external NVSRAM. Maxim/Dallas make NVSRAMs that
have access times of 85 ns -- it might fit your bill at the 10 MIPS speed of
the 18F.

Or, if you can graduate beyond DIP parts, the 64/80-pin 18Fs might fit your
bill. For example, the 18F8620 has 32k-words (2 x 18F452) and the 18F8720
has 64kwords. These also have external memory interfaces (i.e. dedicated
data bus/address lines, I think) to which you can just add the NVSRAM I
mentioned above without any "glue" code.

Lastly, as someone already suggested, switch to assembly, though it may not
be practical if you already have C code that generates >16kwords of ASM.

Cheers,
Ishaan

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