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'[PIC]: Programming 18F devices'
2002\05\14@115910 by =?iso-8859-1?Q?F=E1bio_Pereira?=

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Hello All:

I just started to build my own simple programmer for the 18F devices, but I'm having trouble communicating with the chip. I've built a small plataform based on 16F628 that can receive commands from the RS232 and transmit then to the target device (18F). I was succesfull reading and writing the 16Fxxx devices, but can't do the same with 18F devices (Hey, I know that the protocol is different).
Anyone has experience on transmiting serial commands to program these new chips ??? If anyone could help, maybe we could soon have a free programmer (and maybe an ICD too) for these new devices. I'm planning to write the PC frontend software in delphi 6. If anyone has interest, maybe we could make these chips more accessible to the PIC comunity.

TIA,

Fábio Pereira

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2002\05\15@011320 by uter van ooijen & floortje hanneman

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I just started to build my own simple programmer for the 18F devices, but
I'm having trouble communicating with the chip. I've built a small plataform
based on 16F628 that can receive commands from the RS232 and transmit then
to the target device (18F). I was succesfull reading and writing the 16Fxxx
devices, but can't do the same with 18F devices (Hey, I know that the
protocol is different).
Anyone has experience on transmiting serial commands to program these new
chips ??? If anyone could help, maybe we could soon have a free programmer
(and maybe an ICD too) for these new devices. I'm planning to write the PC
frontend software in delphi 6. If anyone has interest, maybe we could make
these chips more accessible to the PIC comunity.

I have ordered a few 18f's. I will try to make my Wips628 design 18f-capable
when I have the chips. Your setup sounds almost the same (16f628 + rs232
interafce).

Wouter van Ooijen
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2002\05\16@183502 by Les Otter

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Fabio

http://www.microchip.com/download/lit/suppdoc/specs/39028e.pdf

That's the definitive document from Microchip on how to program the PIC18Cxx
devices.  I assume the 18F range will use the same methods.
Hope that helps

Les Otter

{Original Message removed}

2002\05\16@194005 by Bob Ammerman

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> Fabio
>
> http://www.microchip.com/download/lit/suppdoc/specs/39028e.pdf
>
> That's the definitive document from Microchip on how to program the
PIC18Cxx
> devices.  I assume the 18F range will use the same methods.
> Hope that helps
>
> Les Otter

Sorry, the algorithm for 18F chips is completely different. MChip has
modified it to allow for much faster programming because it writes a whole
'panel' of code to flash at once.

Select 'programming specifications' from the 'Developer's Toolbox' on the
MChip main menu to find more info.

Bob Ammerman
RAm Systems

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'[PIC]: Programming 18F devices'
2002\06\06@154736 by =?iso-8859-1?Q?F=E1bio_Pereira?=
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No. At this time I'm using only single panels writes ....

But remember that the single/multi panel mode is valid only for writting the
device. The read is made only byte by byte (ie: two consecutive read
operations to read one word of memory).

Thx,

Fabio Pereira

Ps.: sorry, I forgot (again) to place the [PIC]: reader !!!

Can't help you with the ICD2 timings; I don't have one.

Curious question: are you using the multi-bank programming method? If
you're using the single-bank method, I would expect that programming an
18F452 would take about twice as long as a 16F877, since it has twice as
much program memory; 34 seconds doesn't sound at all bad. It certainly
doesn't sound like a dealbreaker even if you're already using the faster
method.

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