piclist 2001\01\15\194035a >
Thread: grounding unused inputs
www.piclist.com/techref/microchip/ios.htm?key=input
flavicon
face BY : Dwayne Reid email (remove spam text)



At 03:55 PM 1/15/01 -0500, David VanHorn wrote:

>Interesting.
>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
normal operation.

dwayne




Dwayne Reid   <dwayner.....spamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 17 years of Engineering Innovation (1984 - 2001)

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Do NOT send unsolicited commercial email to this email address.
This message neither grants consent to receive unsolicited
commercial email nor is intended to solicit commercial email.

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listservKILLspamspamKILLspammitvma.mit.edu with SET PICList DIGEST in the body


<4.3.2.7.2.20010115170144.00b1bf00@pop.telusplanet.net>

In reply to: <4.3.2.7.2.20010115154948.00c6b400@mail.cedar.net>
See also: www.piclist.com/techref/microchip/ios.htm?key=input
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) grounding unused inputs

month overview.

new search...