Re: [avr-gcc-list] FYI: FW: appnote avr309

[Brian Sidebotham]

There are quite a few errors in this app. note. But at least it does
work when you need it to. I don't bother with the 3.5V regulation, and
run the Atmel at 12Mhz (I use an ATTINY2313 device). I use some series
resistors in the data lines, and my 'pullup' is slightly different to
the app note, but all works well.

I originally started with a level translator, but it didn't seem to
like the 1k5 pull up on the Data- line. :(  When running everything at
5v things seem to work fine.

The code is also for an AT90S2313. I modified it to include the extra
interupt vectors of the ATTINY2313, and there is another piece that
needs changing to allow AVR Studio to assemble the code, but it's
pretty simple.

On 19/09/05, Steve Franks <address@hidden> wrote:
> I thought people would want to know about this:
> 
> > Mr. Franks,
> >
> > You are absolutely right, and after taking a closer look I
> > can also see that
> > the use of 90S2313 would be out of spec. This app.note is
> > written by an
> > external consultant, and I can see our review wasn't good enough.
> >
> >
> > -----Original Message-----
> > From: Steve Franks [mailto:address@hidden
> > Sent: 16. September 2005 00:51
> > To: 'address@hidden'
> > Subject: appnote avr309
> >
> >
> > Hello,
> >
> > Looking at Avr309, I notice a 12MHz xtal is utilized with a
> > 3.5V regulator.
> > However, the "External Clock Drive" table of the AtMega8 (an
> > indeed, most,
> > if not all, avr's) specifies Fmax = 8MHz for Vcc < 4.5V.  Is
> > the app note
> > suggesting running the device out-of-spec?  Please reply.
> >
> > Best,
> > Steve
> >
> > Steve Franks
> > Electrical Engineer
> > Tucson Embedded Systems
> > (520) 575-7283 x171
> >
> 
> 
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