I'd love to see the wireing and sample software for that. I don't see how a
bootloader can load something before its has itself been loaded into the
part. Or am I missing something? Is the bootloader you are referring to a PC
program?

---
James Newton mailto:jamesnewton@geocities.com 1-619-652-0593
http://techref.massmind.org NEW! FINALLY A REAL NAME!
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-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Byron A Jeff
Sent: Thursday, March 16, 2000 21:21
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: Old programmer to new flash??
Importance: Low


>
> You have to get the bootstrap loader in the chip somehow right? Requires a
> minimal traditional programmer.

Well actually it doesn't. Since the chips come with LVP set, it's possible
to program them simply using a cable, without bothering with programming
voltages and whatnot. Connect the cable to the part, program it with the
bootloader, then put it permanently in the target and program via the
serial port. Never requires a high voltage supply and only a single
traditional program.

But the traditional Tait type programmer isn't in the equation anymore.

BAJ
>
> ---
> James Newton mailto:jamesnewton@geocities.com 1-619-652-0593
> http://techref.massmind.org NEW! FINALLY A REAL NAME!
> Members can add private/public comments/pages ($0 TANSTAAFL web hosting)
>
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Byron A Jeff
> Sent: Thursday, March 16, 2000 12:56
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: Old programmer to new flash??
>
>
> >
> > Hiy'all!, has anybody on the list successfully managed to program one
> > of the newer flash parts, for example 16F873 using one of the simple
type
> > programmers designed for 16F84 etc.?.
> >
> > I notice looking at the 16F873 pinout that RB7 and RB6 are marked in a
> > similar way to 16F84 ie. RB7/PGD and RB6/PGC  and MCLR is still
> > MCLR/Vpp, does this mean the 16F873 will program in the old way as used
by
> > 16F84  with no major changes?.
>
> There's only one real caveat. The actual programming command on the 16F84
> (0x08)
> has been changed on the 16F87X parts to mean "erase cell then program".
This
> means
> that instead of the normal 10ms delay, that for the 16F87X part you need a
> 20ms
> delay.
>
> The other solution is to switch to the equivalent command for the 16F87X
> part which
> is 0x18. Then it only requires 10 ms delay again.
>
> >
> > I know it is only a matter of time before there will be a heap of simple
> > programmer designs for the new flash pics (just as there is now for the
> > 16F84), the trend on this list seems to be to use the serial port and a
> > bootstrap loader code block but I guess both programming methods have
> > there advantages and disadvantages?.
>
> I really don't see any big advantage of the traditional programming
method.
> It requires a high voltage supply and typically requires the removal of
> the part from it's intended target.
>
> BAJ
>