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