AVR-Chat

Hi Guys,

I have a very weird problem with my Mega16 (DIP40) running a 16MHz
crystal (22pF loading caps).

Im trying to read incoming data on PIND.0 very rapidly (approx 150kHz)
and the chip just doesnt seem to work correctly. It works perfectly if
I use either PIND.7 or PIND.2 (the only other 2 pins I tried). But as
soon as I swap it back to using PIND.0 it stops working again.

Ive also assertained that the program works fine if I use an internal
8MHz oscillator instead of 16MHz crystal. So I think it might have
something to do with the fact that PIND.0 is right next to a crystal
pin. Could noise from the crystal pin be coupling to the data input
and corrupting the data stream somehow ? could this be happening
inside the Mega16 ? If so it is unfortunate that Atmel have placed the
 RXD pin of the UART right next to the crystal pins.

Unfortunately I really do need to use a 16MHz crystal also, so merely
ignoring the problem and using a slower oscillator will not work !

WOULD APPRECIATE ANY SUGGESTIONS !!!

Thanks
Hein B
Auckland, New Zealand.