grounding unused inputs
Dwayne Reid email (remove spam text)
At 03:55 PM 1/15/01 -0500, David VanHorn wrote:
>I see what you mean here.
>On the AVR or Z8, this isn't a problem because the tris-equivalent
>registers can't be modified by inputs like this.
Hi there, Dave.
Something you wrote puzzles me - maybe there is yet another PIC wrinkle
that I am not aware of. Is there any condition where the TRIS register can
be changed by something happening on the port pins? If so, this is a new
problem to me!
The only port related problem I can think of right now is the
read-modify-write issue - its not a problem since I am aware of it. But I
am not aware of a TRIS register susceptibility. Is there a problem
there? What causes it and what does it do?
I always check or refresh TRIS and other important registers simply because
I can't predict what a nasty ESD or EMI event might do to me - all I can do
is deal with the problem if it happens. But it sure doesn't happen during
Dwayne Reid <planet.eon.net> dwayner
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
Celebrating 17 years of Engineering Innovation (1984 - 2001)
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