ATXMEGA128A4 Datasheet, PDF (46/69 Pages) ATMEL Corporation – 8/16-bit XMEGA A4 Microcontroller

XMEGA A4
28. Program and Debug Interfaces
28.1 Features
28.2 Overview
• PDI - Program and Debug Interface (Atmel proprietary 2-pin interface)
• Boundary-scan capabilities according to the IEEE Std. 1149.1 (JTAG)
• Access to the OCD system
• Programming of Flash, EEPROM, Fuses and Lock Bits
The programming and debug facilities are accessed through PDI physical interface. The PDI
physical interface uses one dedicated pin together with the Reset pin, and no general purpose
pins are used.
28.3 PDI - Program and Debug Interface
The PDI is an Atmel proprietary protocol for communication between the microcontroller and
Atmel’s development tools.
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