> "I want to use a 16F84

Unless you have a bunch of 16F84 in stock, you should really consider the
16F628.  It does more, costs less in the same package.

> with serial devices such as I2C, memories such as
> 93C46, sim cards and MM53200 decoders. There is lots of material on the
net
> dealing with this sort of application but none that I can find deals with
> the sort of things that a beginner needs to know. What I want is not just
a
> circuit of something that works but rather information that will help me
> learn the principles involved.

One at a time.  Start with IIC because it is relatively simple and you can
get cheap off the shelf slave devices.  Microchip has an appnote if I
remember right that is sort of a IIC tutorial.  Look on the net, there
should be lots of info there.  The PIC data sheet for a part that has a
MSSP, like 16F876 for example, also describes what happens on the bus.

If the goal is to lear, then start out programming a master yourself by
directly wiggling I/O lines.  This is actually not very hard, especially
when talking to something simple, like an IIC RAM.

> I have a particular project in mind once I learn enough - a PC logic state
> analyser.

Cool.  But, that's an advanced project.  Don't expect to get something like
that working right away.


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