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AVR JTAG Software Debug Tools

The spy hardware contain 2 ATmega16 : one is the target
and one is the jtag spy. In fact both can be programmed
with the same software.

The JTAG connector is connected as usual for debugging
purposes.
The same connector is also connected to the spy but
in a special manner. The RS232 interface is attached 
to the spy itself.

The power supply has some measurement to guard against
wrong connection of the 12 V adapter. The tension can be
as low as 7 V but you have to use a 100 UF with this type
of low drop regulator.

The filter right before the diode is just precaution to 
get rid of the unwanted EMI of possible mobile phones in
the neighbourhood.

Both ATMega16's are running at 16 MHz so the RS232 can be
set to a maximum of 115200.


Armand