AVR-Chat

----- Original Message -----
From: "Graham Davies" <YahooGroups@ecrostech.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Wednesday, October 27, 2004 3:55 PM
Subject: [AVR-Chat] Re: The Butterfly is flying !!


>
>
> --- In AVR-Chat@yahoogroups.com, "Chuck Hackett" <egroupscdh@W...>
> wrote:
>
> > ... JTAG ICE Cube ... STK500 and ECROS's
> > Butterfly Carrier ... couple of problems ...
>
> Thanks for this post, Chuck, this is the Internet at its best. If I
> do a good job I win, if I don't I lose. No hiding here!
>
> Your start-up problems were, of course, unrelated to the ICE-Cube
> itself and you would have had the same issues with the Atmel JTAG ICE
> or any other. It should also be said that you solved the problems
> yourself though my brain certainly got a work out too!
>
> Regarding the JTAGEN fuse, it is programmed in the chips as they come
> from Atmel, so the safest thing is to leave it alone. You do not need
> an ISP interface (in addition to JTAG) to program this fuse before
> you can start debugging. I agree that AVR Studio's fuse dialog can be
> confusing. The text does seem to say you have the fuse programmed,
> but this is only true if the checkbox at the left has the check mark
> in it. Otherwise, the text is precisely false! (Embedded Systems
> Programming magazine has a good article on user interface design this
> month.)
>
> Graham.

Greetings all
I am new to this group and have some experience with PIC's, Oopics and have
now started experimenting with AVR's. I received my STK500 a week ago and
have been pleasantly surprised at how things have fallen into place. The
richer instruction set is almost like a higher level language, especially
after bashing around with the PIC instruction set.
So far I have managed to get most of the peripherals on the AT90S8515
working and have been debugging my code using the Atmel Studio 4 Simulator.
There are obvious limitations with what can be achieved with the simulator
in terms of real time debugging.

Please can someone explain when and why I will need to use an ICE and how an
ICE actually works. I intend using Mega8 and Mega16 chips which I inderstand
are JTAG supported.

Many thanks
Ian