> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Wouter van Ooijen
> Sent: 01 December 2006 22:25
> To: 'Microcontroller discussion list - Public.'
> Subject: RE: [PIC] home brew pic burner circuit ?
> 
> 
> > > IIRC worts-case USB voltage can be too low to power the
> > > pic-under-programming directly.
> > > 
> > > Wouter van Ooijen
> > my programmer requires the target to be self powered (i did 
> > try in an early prototype powering the target off usb but 
> > resets of the programmer whenever i plugged the target in 
> > made me decide this was a bad idea), but the pic in the 
> > programmer could be an issue.
> > 
> > I could probablly run the programmer firmware at a lower 
> > clock but i never got arround to actually trying that.
> 
> what would that solve? the Vdd requirement for programming is not
> clock-dependent.
the Vdd requirement for the target is a non issue because the target is not powered by the programmer

the Vdd requirement for the pic in the programmer may be an issue though with suckier USB ports (though it's never to my knowlage been a problem in practice)



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