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PICList Thread
'[PIC]: Program on external flash memory'
2002\11\06@004249 by Tan Chun Chiek

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Hi,
   Is it possible to run a PIC from the program in an external flash? I'm
thinking of the possibility of a firmware sitting in the PIC that grabs the
program from a flash chip. It would be especially useful for developing
programs for OTP PICs minus the cost of a JW part and eprom eraser.

Regards,
Tan

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2002\11\06@011820 by Mike Singer

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Tan Chun Chiek
> Hi,
>     Is it possible to run a PIC from the program in an external flash?
I'm
> thinking of the possibility of a firmware sitting in the PIC that
grabs the
> program from a flash chip. It would be especially useful for
developing
> programs for OTP PICs minus the cost of a JW part and eprom eraser.

39541a.pdf
PIC18C601/801  High-Performance ROM-less Microcontrollers
with External Memory Bus  about 4 $ retail.

Mike.

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2002\11\06@013238 by Tan Chun Chiek

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Thank you, but i'm particularly interested in the 16c765/745 for its USB
features

Tan

----- Original Message -----
From: "Mike Singer" <msingerspamKILLspamPOLUOSTROV.NET>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Wednesday, November 06, 2002 1:17 PM
Subject: Re: [PIC]: Program on external flash memory


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2002\11\06@014059 by Josh Koffman

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I believe the 17 series are the only ones that can run with external
program memory. Another way to do it would be to have a boot loader that
runs on a flash PIC, reads a program off an external chip, and programs
itself. I think this might have been mentioned on the list before. Of
course, unless you need very specific hardware peripherals (such as an
LCD driver), why not just go to a flash based PIC and ICSP or ICD?

Josh
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Tan Chun Chiek wrote:
>
> Hi,
>     Is it possible to run a PIC from the program in an external flash? I'm
> thinking of the possibility of a firmware sitting in the PIC that grabs the
> program from a flash chip. It would be especially useful for developing
> programs for OTP PICs minus the cost of a JW part and eprom eraser.

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2002\11\06@075431 by Olin Lathrop

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> Is it possible to run a PIC from the program in an external flash?

Only a few 17 and 18 series PICs can do this.  Microchip calls this
"microprocessor mode", as apposed to "microcontroller mode".


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