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Subject: Re: [PIC:] Programming Interface
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On Fri, Jan 30, 2004 at 01:27:51PM +0100, Vidal wrote:
> From: "Andre Miller" <andre.miller@BLUERIVER.CO.ZA>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Friday, January 30, 2004 12:58 PM
> Subject: Re: [PIC:] Programming Interface
>
> > I [..] have managed to build a simple
> > interface that uses the serial port and supply the +13V for non-LVP without
> > an external supply.
>
> Thank you for the advice, I will look into it.
>
> Is it neccessary to have the +13 V?

Not exactly. There are two different programming modes: Low Voltage Programming
(LVP) and High Voltage Programming (HVP). LVP is 5V only, however you lose the
use of an I/O pin (RB3/LVP). With HVP you retain use of all of the hardware.

> As far as I can see from
> the PIC16F87XA manual only 5 V is needed for programming.

That's LVP. It works fine and I've built a 16F programming system around it:

http://www.finitesite.com/d3jsys

>
> Or have I misunderstood that?

I think you just didn't have the whole picture.

BAJ

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