Re: [avr-gcc-list] atmega16

[Russell Shaw]

address@hidden wrote:
> > > I'll like to now some details about atmega16. Can I use some pins of
> > > Port A as Analog Inputs while some others will be used as d\ igital
> > > in/out ?
> >
> > Yes, but noise may be induced on an analog input if a port A output switches 
> > levels.
>
>
> Do you mean that coupling among the same port is somehow tighter then
> coupling with pins of another port? My gues would be no, but your
> formulation provoked this question in my mind:
>
>  If one have to switch output level during the A/D conversion, are
>  there better and worse pin assignments to choose from?
>
> My choice would be to use pins which are physically far apart but
> maybe somebody knows better...
>
> Vaclav Hanzl

P.204 of mega16 data sheet:

4. If any ADC port pins are used as digital outputs, it is essential that these 
do
   not switch while a conversion is in progress.

Load currents cause a voltage glitch in any ground wiring common to the
other port A pins.