Robert,

> I suppose that for the purpose of this application note, the
> people with microchip decided to oversimplify the routines
> for better pedagogy.

I think that this is definitely the case and that too much is being read i=
nto
the WDT thing.
The writer of the Ap-note is caught between a rock and hard place -
either he provides a complete application and obscures the information
he is trying to explain, or he cuts it down to the bare minimum and gets
complaints that the solution is too simple.

There are obvious symptoms of this in the code itself. For example, the
foreground code is -

Main    clrwdt                  ; Clear the WDT
        goto            Main    ; Loop forever.

Clearly it is not a complete application.

In regards to the comment
; If we aren=92t in State5, then something is wrong.

Look at the way you get to that point in the program flow

Is it status 1 ? No, try the next one.
Is it status 2 ? No, try the next one
Is it status 3 ? No, try the next one
Is it status 4 ? No, try the next one
Is it status 5 ?
There are no more situations that are valid, so it's an error.
If it was valid (at status 5), the function returns, ready for the next
transaction. That seems reasonable as a NACK is a valid thing and
there is nothing that needs to be done in response to getting one.

Steve.

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Steve Baldwin                          Electronic Product Design
TLA Microsystems Ltd             Microcontroller Specialists
PO Box 15-680, New Lynn                http://www.tla.co.nz
Auckland, New Zealand                     ph  +64 9 820-2221
email: steve@tla.co.nz                      fax +64 9 820-1929
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