gnupic: Re: [gnupic] more on weird resets
Subject:
[gnupic] more on weird resets
From:
Bill Freeman ####@####.####
Date:
1 Aug 2005 04:46:25 +0100
Message-Id: <17133.39895.106865.328846@localhost.localdomain>
While power problems can be subtle, unless you're drivning
large loads with the outputs, I don't think that its likely to be a
power impedance problem. I've certainly gotten away with awful power
wiring in th past, and that's with about 40 mA of loads on outputs.
Where I did see a problem similar to what you describe was
when I left MCLR floating. (I was pretty new to PICs, and wanted to
avoid having to disconnect MCLR from the rest of the circuit for
reprogramming.) That was with a 16F84, several years ago.
It's conceivable that your bread board has enough leakage to
+V to make things OK. I've heard various suggestions for MCLR in this
discussion, but unless it's connected to a long lead, I think that a
10K pullup is enough. It worked for me.
My application was battery operated, drove a speaker and an
LED. I also learned that pulling all unused inputs up or down helps
with power consumption in sleep, just in case that's interesting.
Bill
