> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Gerhard Fiedler
> Sent: 31 December 2006 13:07
> To: piclist@mit.edu
> Subject: Re: [PIC] Code protection for 3V operation
> 
> 
> Mike Harrison wrote:
> 
> >>> The main chips I use are PIC18LF6720, PIC18LF2520 and 
> PIC18LF1320. I do
> >>> not have a programmer suitable for programming any of these SMD IC's
> >>> before being placed into the target application.
> > 
> > Remember that you can program and secure a new chip at 3V, so you could
> > solder the chips then program in the bootloader on-board. The only thing
> > you can't do is erase the security bit to reprogram.
> 
> Maybe this doesn't apply to the OP's circuit, but can't you use 5V
> programming in a 3V circuit? Like making the rest of the circuit 5V
> tolerant or creating some kind of separation between the micro 
> and the rest
> (maybe two solder pads that get closed only after programming). 
or just shove a shotkey diode in the power supply to the pic, that way the programmer can drag it up to 5V without effecting the rest of the power net (just make sure anything hanging off PGC/PGD is 5V tolerant).


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