Connecting Atmel-ICE to a JTAG Target

Last modified by Microchip on 2023/12/15 19:56

Contents

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

When designing an application Printed Circuit Board (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.

Recommended Pinout for AVR with the JTAG Interface

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AVR JTAG Header Pinout

When designing an application PCB that 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.

AVR JTAG Header Pinout

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SAM JTAG Header Pinout

SAM JTAG Header Pinout

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Atmel-ICE Connection Options

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

Atmel-ICE Connection Options Chart

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