Programming and debugging header

The Atmel ATxmega128B1 can be programmed and debugged by connecting an external programming and debugging tool to the PDI header. The header has a standard PDI programmer pinout (refer to online help in Atmel Studio), and tools such as JTAGICE3, AVR ONE! or JTAGICE mkII can thus be connected to the PDI header. If it is desired to use PDI for programming and debugging an adapter must be used:

(Dark blue) debugWIRE, SPI, PDI, aWire Adaptor for JTAGICE3, ref. A08-0735
(Green) Standoff Adaptor nr.3 JTAG/ISP for AVR ONE!, ref. A08-0254
(White) Xmega PDI Adaptor for JTAGICE mkII, ref. A09-0412

Note: A scoring in the board is made to fit the orientation tab on the header.

Table 1. XMEGA-B1 Xplained programming and debugging PDI interface
Pin	PDI¹	JTAGICE3	AVRONE!	JTAGICE mkII
1	PDI_DATA	debugWIRE, SPI, PDI, aWire adaptor ref. A08-0735. Color: dark blue	Standoff adaptor nr.3 JTAG/ISP ref. A08-0254. Color: green	Xmega PDI adaptor ref. A09-0412. Color: white
2	VTG (default 3.3V)
3
4
5	PDI_CLOCK
6	GND

Note: The device also features a JTAG port for programming and debugging. To optimize the onboard I/O management, the JTAG pin allocation (PB[7:4]) is used to drive user LEDs. The JTAG can be connected through the header J3 but malfunctions may happen because of the LEDs. If “clean” JTAG port is needed, the LED series resistors (or the LEDs themselves) can be removed. By default, the JTAG port is disabled by fuse in the ATxmega128B1 that is mounted on the board.