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'[PIC]: 18F proggy'
2002\10\03@200707 by Tony Nixon

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Hi all,

After a long wait getting a chip and a couple of nights work, I finally
got 18F capabillity for my programmer. Wasn't as bad to do as I thought.

I know programming multiple bytes can save time, but all that extra
instruction shifting in has to slow it down too.

I hope now they keep these programming algorithm changes quiet for
awhile.

:-)

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Tony

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2002\10\04@082815 by Olin Lathrop

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> After a long wait getting a chip and a couple of nights work, I finally
> got 18F capabillity for my programmer. Wasn't as bad to do as I thought.
>
> I know programming multiple bytes can save time, but all that extra
> instruction shifting in has to slow it down too.
>
> I hope now they keep these programming algorithm changes quiet for

I'm curious, which programming method did you use?  Individual words, single
panel, multiple panel?

I did this recently too and decided that multiple panel writes just weren't
worth all the extra trouble, special restrictions, and jumping around the
memory space.  I used single panel writes for program memory.  My system can
write the complete program memory of a 18F252 (32Kbytes) in 11.5 seconds.
With one verify pass at each Vcc limit, the total comes to 24.7 seconds.  I
know this is slower than it could be done, but adequate for my purposes.

I'm curious how this compares to approaches others have taken starting with
the same data sheet.


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2002\10\04@084229 by Wouter van Ooijen

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> I did this recently too and decided that multiple panel
> writes just weren't
> worth all the extra trouble, special restrictions, and
> jumping around the
> memory space.  I used single panel writes for program memory.

I made the same choice. From the datasheet it was not clear to me how
the program memory in the higher panes that 'overlaps' the bootblock
should be written using multiple panel writes. And it seems such a
hassle, and the 18F's are already fast anyway.

Wouter van Ooijen

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2002\10\06@184225 by Tony Nixon

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I used multiple panel writes, but I'm thinking of changing it to single
because of the way the rest of my programmer software is set up.

Olin Lathrop wrote:

> I'm curious, which programming method did you use?  Individual words, single
> panel, multiple panel?

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Best regards

Tony

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2002\10\06@191653 by Olin Lathrop

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> I used multiple panel writes, but I'm thinking of changing it to single
> because of the way the rest of my programmer software is set up.

What kind of speed did you get doing multiple panel writes?  For example,
how long does it take to write to the entire program memory of a 18F252?


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2002\10\06@192537 by Tony Nixon

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It's quite slow because of the way my programmer software transfers the
data as I have to do the 18F 4 words at a time to fill the write buffers
before programming.

Doing it the 'normal' way for my programmer can be much faster and also
depends on the linear code size being programmed. Not much point
programming $FFFF in blank locations to the end of the ROM space.

Olin Lathrop wrote:
>
> > I used multiple panel writes, but I'm thinking of changing it to single
> > because of the way the rest of my programmer software is set up.
>
> What kind of speed did you get doing multiple panel writes?  For example,
> how long does it take to write to the entire program memory of a 18F252?


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Tony

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