fwallenwein schreibt With the JTAG-ICE you can programm and debug all AVR microcontrollers that have a JTAG interface.
( ATmega16, ATmega162, ATmega169, ATmega32, ATmega323, ATmega64, ATmega128, ATmega256).
You can use it as a debugging interface. Single step through your programm direct on the controller hardware.
Check variables, set breakpoints ( up to 3 ) and verify your programm.
A tool every serious AVR software delevoper needs.
The JTAG-ICE is supported by AVR-Studio and also by free tools like avrdude, gdb ( debugger )