AVR-Chat

On Tue, 2005-08-30 at 19:48 +0000, jdelgadillo66 wrote:
> Hi
> Sorry but Im a microcontroller beginner and I have a lot of
> questions, 
> Its necesary put in my circuits pull down resistors, I have a low
> input pin (atmega8) and expect receive a 1 logic, Is it posible have
> trouble (noise) if I havent a resistor pull down?, Is best practice
> put a resistor pull down?
> Thanks a lot

  Perhaps I am missing something, here.  AVR processors have selectable
pull UP resisotrs on each and every digital I/O pin.  Since a low
voltage is a logic 1, you don't need "pull down" resistors on AVR
inputs.

  If you mean pu;l;l-up resisots, that's different, but they're
selectable in software, and do not require any external components.

Tom