Connecting Atmel-ICE to a JTAG Target

The Atmel-ICE Probe has two 50-mil 10-pin Joint Test Action Group (JTAG) connectors accessible on the front of the tool's enclosure. Both connectors are directly electrically connected, but conform to two different pinouts:

1) AVR® JTAG header
2) ARM® Cortex® Debug header

The connector should be selected based on the pinout of the target board and not the target MCU type - for example, a SAM device mounted in an AVR STK600 stack should use the AVR header.

JTAG Interface Basics

jtag_overview.png

When designing an application PCB which includes an AVR with the JTAG interface, it is recommended to use the pinout as shown. The Atmel-ICE can connect to both 100-mil and 50-mil variants of this pinout.

AVR JTAG Header Pinout

avr_jtag_header.png

When designing an application PCB which includes a SAM device with the JTAG interface, it is recommended to use the pinout shown. The Atmel-ICE can connect to both 100-mil and 50-mil variants of this pinout.

SAM JTAG Header Pinout

sam_jtag_header.png

Atmel-ICE Connection Options

The chart shows the pinouts for each connector type and a description of each pin.

jtag_pinout.png
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