On Thursday 14 January 2010, Paul Fertser wrote:
> >       The On-chip Debug support is considered being private
> >       JTAG instructions, and distributed within ATMEL and to
> >       selected third party vendors only.
> > 
> > Clearly, someone needs to throw a JTAG/SPI sniffer at some of the
> > transactions issued by AVR studio, and so some "reverse engineering
> > for interoperability".  :)
> 
> Luckily someone already did that, see [1] (they used Free AVR ICE to
> sniff).
> 
> [1] http://mirrors.igsobe.com/nongnu/freeice/AVR-OCD-Documentation.html

Interesting ... not all that current, and if you look at
for example the ATmega32 docs it gives a different picture
of things (e.g. roughly what the four debug registers do).
But, clearly a decent start.  :)


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