On 2/22/07, Wouter van Ooijen <wouter@voti.nl> wrote:

> Side note: a few days ago someone asked me whether he could program a
> PIC with only two wires. I responded that it is not possible: even for a
> bootloader (stretching the term 'programming' a bit) you need ground and
> power, plus a wire to carry data.

  AFIR, one of your bootloaders are working like this.


Last night I was thinking about this
> and I think I was wrong.

 One choiche is a bootloader on USART without verifying algorithm implemented.
It will need just TX and ground and might work. Of course the
bootloader must be previously loaded somehow.


Are there any PICs with an accessible internal
> voltage reference (an absolute one, not one derived from Vdd)?

What is your point?

>
>
> Wouter van Ooijen
>
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