7.3.2 Atmel AVR XMEGA OCD (JTAG and PDI Physical)

The Atmel AVR XMEGA OCD is otherwise known as PDI (Program and Debug Interface). Two physical interfaces (JTAG and PDI Physical) provide access to the same OCD implementation within the device. It supports the following features:

Complete program flow control
1 dedicated program address comparator or symbolic breakpoint (reserved)
4 hardware comparators
Unlimited number of user program breakpoints (using BREAK)
No limitation on system clock frequency

For special considerations regarding this debug interface, see Special Considerations.

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