On Fri, Sep 10, 2004 at 03:37:51PM +0200, Wouter van Ooijen wrote:
> > Right now, I'm leaning towards using Byron Jeff's design for the
> 
> fine, as long as
> - you use part that are LVP (12F629 etc are not!)
> - you don't need the LVP pin (it is claimed by the LVP feature)

I have an HVP version too:

http://www.finitesite.com/d3jsys/proghvp.html

It just adds the HVP switch and requires a 13V supply.

I'll be the first to admit that it isn't perfect because there's
no way to use it ICSP without adding a second high side switch
and a 5V pullup. But remember that the Trivial programmer's 
primary function is to serve as a bootloader bootstrapper. So unlike
the Wisp628, which is a much much better overall programmer, it doesn't
have all the extra amenities.

> 
> > number of simple PICs, and it looks like the 12F629/16F630 will fit
> 
> Note that to (re)program this part with /MCLR configured as Input pin
> you will need to power cycle the chip as part of the programming
> process, this is an extra design thing for ICSP.

IIRC you simply shorted the Vdd right? I guess the right way to do it
is to have a logic level MOSFET as a switch between +5 and Vdd on the PIC

BAJ
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