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'17C756'
1997\06\03@110042 by Antonio Almeida

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Can the PICstart Plus program the 17C756. If not what programmer can ?

TIA,
A. Almeida

1997\06\04@094151 by Jim Robertson

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At 02:55 PM 6/3/97 +0000, you wrote:
>Can the PICstart Plus program the 17C756. If not what programmer can ?
>
>TIA,
>A. Almeida
>
According to the information I have the PICSTART PLUS and promate both can
program the 17C756 with an adapter. I don't know anything more than this. I
think you will have to approach microchip for details yourself.

As for 3rd party programmers, microchip have not released the programming
specs yet so I don't see how any 3rd parties can be supporting it. I have
just started pushing for these details myself. I think we have waited long
enough.

Jim

1997\06\06@092424 by Jim Robertson

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At 02:55 PM 6/3/97 +0000, you wrote:
>Can the PICstart Plus program the 17C756. If not what programmer can ?
>
>TIA,
>A. Almeida
>

Previously I replied:

According to the information I have the PICSTART PLUS and promate both can
program the 17C756 with an adapter. I don't know anything more than this. I
think you will have to approach microchip for details yourself.

As for 3rd party programmers, microchip have not released the programming
specs yet so I don't see how any 3rd parties can be supporting it. I have
just started pushing for these details myself. I think we have waited long
enough.

Jim


Now I have further information courtesy of microchip and I am offering
support for the 17C752 and 756 with my low cost warp-17 programmer.  The
wiring diagrams for all 17C75x package types is in the adapter file on my
web page.

http://www.labyrinth.net.au/~newfound/adapter.html

The driver will be placed there shortly but will require the warp-17 "TM4"
firmware release for full 17C75x support.

Jim


'17c756'
1998\04\12@200630 by Martin Walton
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Does anyone know where I can get the PIC17c756 CL (windowed PLCC version)
in the U.K.  I only want a few to do some prototyping with.  Maplin lists
them in their new catalogue, but for a silly price (about £50 each for
quantities less than 10 including VAT).
Neither RS nor Farnell list them in their lastest catalogues.

Martin Walton


'17c756'
1998\12\14@152923 by silicontao_roy
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I am starting a project using a PIC17c756 and need to know if any one has
used them before.
The book I have tells me that "The boot code is normally programmed into the
PIC17cXXX using a PRO Mate or PICStart Plus or any third party programmer."
Does this mean that the boot code is not in a new 17c756? I have the
PICStart Plus but no adapter to use it with the 17cXXX. Once the boot code
is in I can use a COM port on my PC to send the program to it. The boot code
will not erase from the PIC so I only need to get the boot code into the PIC
is that right? If I use a COM port on my PC, what software can I use to send
the code to the PIC? I does not tell me what baud rate to use or how to deal
with configuration bits or reply's from the PIC.
Any help would be great thanks.

Roy Souther
spam_OUTsilicontao_royTakeThisOuTspamtechnologist.com

1998\12\14@210136 by Andrew Kalman

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Hi Roy:

Re:

{Quote hidden}

I think you're referring to uChip's TB015 that deals with programming a
PIC17C756 via boot code.

TB015 is _an_example_ of how one might go about doing this -- i.e. the
parts are pre-programmed _by_the_user_ with a "boot loader" which talks
RS-232 over one of the COM ports. Then, they're stuffed onto boards, then
(i.e. "in production") the boards are powered up and the final code is
downloaded into them via a terminal-like program.  You as the user have to
supply all the code in the PIC, and program the boot loader, too. You also
have to design the protocol to talk between the PIC and the terminal
program or whatever you use to download code into the PIC.

uChip is trying to illustrate how to avoid having to use one of their
programmers in production -- instead, to follow TB105 you have the parts
_preprogrammed_ with a boot loader, and then if you can supply the board
with Vpp you can program (once) the on-board PROM (OTP) with your
application. You would _never_ be able to erase anything in this scheme
(unless it was a windowed part, in which case you could only erase it in
toto), only overwrite it to NOP instructions.  You would select the
microcontroller mode in this example.

So the short answer is that there's no code  "already in" the 17C756 to
implement this boot loader, software-download scheme --  it's entirely up
to you to implement the whole thing.

Now, one way you _could_ do it would be to use external flash memory, and
configure the chip to run in exteded microcontroller mode.  Without going
into too much detail, this means that you dedicate the first 1/4 of the
code space to what is essentially a permanent, unalterable boot loader
containing also the startup and interrupt vectors, and the remaining 3/4 of
the code lives in external flash memory. See p. 42 & 43 of the 17C756
databook.

Your boot loader would need to be able to "talk" some common file-transfer
protocol so that any terminal program can be used. It would need to
understand how to re-write the flash memory with a new file sent from the
terminal program. Said file would be in Intel Hex format (or Motorola
S-records or whatever), so as to give the boot loader an idea of where to
put the file being downloaded.

The downside to this approach is that you can't dedicate less than 16k
words (remember, the address space is 64k words) to the boot loader because
that's where the "internal/external split" is hardcoded into the extended
microcontroller configuration. I would guess that you can probably do the
boot loader in less than 4k words.

Hope this helps.



___________________________________________
| Andrew E. Kalman, Ph.D.   .....aekKILLspamspam@spam@netcom.com  |
|        standard disclaimers apply         |
|___________________________________________|

1998\12\15@084809 by WF AUTOMACAO

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Roy Souther wrote:
>
> I am starting a project using a PIC17c756 and need to know if any one has
> used them before.

Me! :) See my PICextern Products! Now, i finished for the 80C251 too!

> The book I have tells me that "The boot code is normally programmed into the
> PIC17cXXX using a PRO Mate or PICStart Plus or any third party programmer."
> Does this mean that the boot code is not in a new 17c756? I have the
> PICStart Plus but no adapter to use it with the 17cXXX. Once the boot code

You can obtain the Adapter on DIGIKEY! I got it there!

> is in I can use a COM port on my PC to send the program to it. The boot code
> will not erase from the PIC so I only need to get the boot code into the PIC
> is that right?

I did a Boot LOADER!

> If I use a COM port on my PC, what software can I use to send
> the code to the PIC? I does not tell me what baud rate to use or how to deal
> with configuration bits or reply's from the PIC.

I can send the PIC17C756 on MICROPROCESSOR MODE...

> Any help would be great thanks.
>
> Roy Souther
> silicontao_royspamKILLspamtechnologist.com

Please,

See http://www.furb.rct-sc.br/~mw/isd_i.html or
   http://www.inf.ufsc.br/~mw/isd_i.html

Miguel


'17c756'
1999\12\02@110503 by chris tolley
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hi
in my previous hunting for details i came across a project that utilised a
bootloader on the 756 and flash ram for the program to live in and it was
programmed via serial port
does anyone know where i can find this again
many thanks
chris

1999\12\02@111716 by - KITS EDUCACIONAIS NACIONAIS

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chris tolley wrote:
>
> hi
> in my previous hunting for details i came across a project that utilised a
> bootloader on the 756 and flash ram for the program to live in and it was
> programmed via serial port
> does anyone know where i can find this again
> many thanks
> chris

PICextern ?????

http://www.furb.rct-sc.br/~mw/isd_i.html

Miguel

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