The AVR® JTAGICE mkII from Atmel® is a powerful development tool for On-chip Debugging of all AVR 8-bit RISC MCUs and AVR32 32-bit DSP/MCUs with IEEE 1149.1 compliant JTAG interface.
The JTAGICE mkII also support devices with debugWIRE Interface. debugWIRE enables on-chip debug of AVR microcontrollers in small pin count packages, using only a single wire for the debug interface.
The AVR Studio online-help contains the most current information and a complete list of supported devices.
Read more about AVR 8-bit RISC microcontrollers.
The JTAGICE mkII is supported by the AVR32 Studio.
Read more about AVR32 32-bit MCU/DSP.