AVR-Chat

Yes it is the Mavcric-IIb!  I am glad the cap is already there.  I 
foud that I got decent readings once I fixed my code and set the ACR 
to use the AVCC instead of the "default" AREF.

One other question:  in one of the little write-ups here on ADC, it 
said that "AVCC should be connected to VCC whenever PORTA is used a 
output.  This is because PORTA is always sourced by AVCC."  I think 
this write-up was specifically dealing with the 8535, so I do not know 
how that info applies to the 128.

I do not have AREF connected to anything and PORTA is working fine as 
output and input for my keypad scanning code.  

Is this true, and do I need to do anything special about it?

-Tony

--- In AVR-Chat@yahoogroups.com, Brian Dean <bsd@b...> wrote:
> Hi Tony,
> 
> On Sun, Apr 24, 2005 at 02:08:52AM -0000, arhodes19044 wrote:
> 
> > The docs say "AVCC, with external capacitor at AREF pin".  Do I 
HAVE
> > to use the cap?  If so, what size?
> 
> This is your MAVRIC-IIB, correct?  If so, then it already has the cap
> installed.
> 
> -Brian
> -- 
> Brian Dean
> BDMICRO - ATmega128 Based MAVRIC Controllers
> http://www.bdmicro.com/