AVR-Chat

kernels_nz wrote:

>Another thing worth mentioning . . . I have noticed that PIND.0 is
>also starting to load my input signal for no apparent reason after a
>while of operation. The input signal is buffered, output swing is GND
>to 5V. After a while of running with this signal connected to PIND.0,
>the output swing measured with my scope droops to GND to approx 2.5V
>  
>

   Maybe a silly thought, but:  have you tried this with a different 
chip?  This loading issue makes it sound to me as if perhaps your AVR 
chip is damaged, particularly that something is wrong with the harware 
associated with PIND.0.

tom