The new Square One book on Serial Programming for the PIC is
very good also. It has some nice explanations and routines
in it.  It explains all the different ways, including using
RS232 and two wire, one wire, I2C, etc. http://www.sq-1.com

Dan

-----Original Message-----
From: Greg Wiley <greg@LOOP.COM>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Monday, July 26, 1999 12:50 PM
Subject: Re: Serial programming


>Darren Logan <DAZLOGAN@AOL.COM> wrote:
>
>
>> Can someone explain to me how one can program a PIC
serially using only
>two
>> pins ??.
>
>Excruciating detail is available in the
>programming spec sheets at microchip.
>Different devices have different specs.
>
>It's not really just two pins, you need
>to supply power, ground, and a program
>signal.  But once that's done, you shift
>the programming commands in using
>two pins.  On one pin (program data),
>you set the bit to be shifted, on the
>other pin (program clock) you toggle
>the levels to shift the data bit in.
>
>> Where can I find the serial programmers ?? and how do
they work ??
>
>Read the articles by Myke Predko
>at www.rentron.com/pic.htm for a
>much better explanation and a simple
>programmer (for the 16F84) circuit.
>
>  -greg