AVR-Chat

Hi Zack,

I've grounded it after not being able to figure out why it keeps
firing.  I figured that if it was grounded it couldn't be a hardware
issue.  I grounded it via a very short wire.

Thanks,

Richard

--- In AVR-Chat@yahoogroups.com, Zack Widup <w9sz@...> wrote:
>
> 
> Hi Richard,
> 
> My first thought is that if it's grounded, why are you setting it up
for 
> use in firmware? Why not just disable it?
> 
> How is it grounded?  Do you have a long circuit trace or wire to ground 
> that might be picking up crosstalk from other nearby lines? Is it 
> "grounded" through another circuit such as a TTL or CMOS chip?
> 
> Zack
> 
> 
> On Mon, 17 Dec 2007, Richard Cooke wrote:
> 
> > Hi Folks,
> >
> > I'll try this question again as my post of Dec 15th didn't receive any
> > replies.
> >
> > What would cause the INT0 to continually fire even if the pin was
> > grounded?  I have the set to trigger on rising edge (MCUCR = 0x03) but
> > it will keep triggering.  I have also tried to set it to "any logical
> > change" (MCUCR = 0x01) but get the same results.
> >
> > Anybody have any ideas why a pin that is grounded would trigger an
> > interrupt?
> >
> > Thanks,
> >
> > Richard Cooke
> >
>