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PICList Thread
'[PIC]: PIC16F, 18C, and 17C'
2001\01\18@113503 by truth ocean

picon face
Greetings,

I wonder if someone out there knows the answers (or some hints) to the
follwoing questions about the PIC16F and PIC18C families.

1) Can I have an external ROM or Flash (say 512K or more)holding some
instructions and then read them from PIC in real-time. (the problem is that
PIC program memory may not be enough to hold the entire program.)

2) Would it be possible to do the above with two or more PICS each holding
part of the program?

3) Can I have an external (S)RAM (say 128K or more) holding part of the
processing data (say an image that must be processed, but takes more
space than PIC's data memory) and send it to PIC during the real-time
operation?

AND, one more question about PIC17C7X (I know this one is capable of
extended memory, limited to 64K though):

4) Where can I find a good proto board for PIC17C7X?

Appreciate your help.

Ocean
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2001\01\18@122121 by Douglas Wood

picon face
I have a schematic of a 17C756-based platform that I develop on. It has
external FLASH for program storage and external SRAM for data. By using a
phantom addressing scheme, I am able to get more than 64K total memory out
of the 17C756 (something like 64K for external FLASH and 32K for external
SRAM). Let me know if you're interested this.

Douglas Wood
Software Engineer
spam_OUTdbwoodTakeThisOuTspamkc.rr.com

Home of EIS (Enhanced Instruction Set) for the PIC
{Original Message removed}

2001\01\18@125035 by Andrew E. Kalman

flavicon
face
Re:

>  > AND, one more question about PIC17C7X (I know this one is capable of
>  > extended memory, limited to 64K though):
>  >
>  > 4) Where can I find a good proto board for PIC17C7X?


Check out http://www.pumpkininc.com/content/doc/guide/ag-5.pdf. It
contains complete schematics and a bunch of other info for a working
PIC17C756-based proto system that has external Flash and RAM, with
different memory maps available to you.
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  Andrew E. Kalman, Ph.D.   .....aekKILLspamspam@spam@pumpkininc.com

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2001\01\18@144135 by Bob Ammerman

picon face
> 1) Can I have an external ROM or Flash (say 512K or more)holding some
> instructions and then read them from PIC in real-time. (the problem is
that
> PIC program memory may not be enough to hold the entire program.)

Only on some 17C and some upcoming (future product) 18F's.

> 2) Would it be possible to do the above with two or more PICS each holding
> part of the program?

Depends on your program.

> 3) Can I have an external (S)RAM (say 128K or more) holding part of the
> processing data (say an image that must be processed, but takes more
> space than PIC's data memory) and send it to PIC during the real-time
> operation?

Sure.

> AND, one more question about PIC17C7X (I know this one is capable of
> extended memory, limited to 64K though):
> 4) Where can I find a good proto board for PIC17C7X?

Lots of places.

> Appreciate your help.

Actually, if your app needs 512K code and 128K RAM is is probably way too
much for a PIC.

I'd suggest using a PC104 based system. The big advantage here is that you
can use PC tools to build your program, and probably do most of your
debugging on the PC.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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