AVR-Chat

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
>