> As a future suggestion, shorter messages seem to gather more responses
than
> longer detailed ones.  You might have asked for your first question, "I'm
using
> the CCP modules as an interrupt driven full-deuplex rs-232 transciever.
It
> appears as though the two ccp channels are interacting, and I can only do
> half-duplex.  Has anyone else had any trouble using one channel as a
compare and
> the other as a capture simultaneously?"

Ah, so that's what he wanted.

Note that when two CCP modules are used with one in capture mode and the
other in compare mode, that the compare has to be configured as the special
event trigger, which clears timer 1.  There are also some flakies lurking in
the CCP modules in some chips.  I got caught with a CCP module compare bug
on a 16C77 once, which may be the same circuit as the one in whatever chip
you are using.  I don't remember the details, but you need to check the
errata sheet for the part you are using.

In fact, you should *always* check the errata sheets every time you go to a
new PIC.  I make it a habit to review the errata sheet at the start of every
project, even if I think I'm already familiar with the chip.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@cognivis.com, http://www.cognivis.com

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