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[avr-gcc-list] r-engineering the JTAG-ICE protocol

From: Karl Ran
Subject: [avr-gcc-list] r-engineering the JTAG-ICE protocol
Date: Sat, 05 Oct 2002 13:23:44 +0000

Hi there!

I'd like to know if anyone already started to reverse-engineer the
AVR-onchip-JTAG-ICE command-set on the newer Mega16++ AVRs.
If not, anyone knows the complexity of the ICE command-sets on the
microconrollers in general?

I realy wonder why Atmel put a big Mega163 in its JTAG-RS232 interface.

How hard can it be?
JTAG is synchronouns protocol, AFAIK. So it should be quite easy to
capture, right?

I'd guess the (binary) commands could look like these:
Set bp as/ds
Clr bp as/ds
read mem
write mem
read reg
write reg
set pc
read ICE-status
read adr-bus history

Am I totaly on the wrong track here?

Any tips, infos, etc are welcome!


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