7.2.3 PDI Physical

The Program and Debug Interface (PDI) is an Atmel proprietary interface for external programming and on-chip debugging of a device. PDI Physical is a 2-pin interface providing a bi-directional half-duplex synchronous communication with the target device.

When designing an application PCB which includes an AVR with the PDI interface, the pinout shown in Figure 4-5 should be used.