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<body id="GUID-27BF3A3E-B61E-485F-8816-EBB7F5642827">
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<h1 class="title topictitle1">AVR JTAG Pinout</h1>
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<div class="body"><p class="p">When designing an application PCB, which includes an Atmel AVR with the
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JTAG interface, it is recommended to use the pinout as shown in the figure below. Both
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100-mil and 50-mil variants of this pinout are supported, depending on the cabling and
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adapters included with the particular kit.</p>
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<div class="fig fignone" id="GUID-27BF3A3E-B61E-485F-8816-EBB7F5642827__ATMELICE.JTAG_HEADER_PINOUT"><span class="figcap">Figure 1. AVR JTAG Header Pinout</span><br/><img class="image" src="GUID-E82E83BA-49F0-4C7D-8368-651F988A95BE-low.png" width="151"/><br/></div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="GUID-27BF3A3E-B61E-485F-8816-EBB7F5642827__GUID-441A0C5B-9737-4AD2-BBE8-BC6F639D9BCD" class="table" frame="border" border="1" rules="all"><caption><span class="tablecap">Table 1. AVR JTAG Pin Description</span></caption><thead class="thead" align="left"><tr class="row"><th class="entry" align="center" valign="top" width="10%" id="d2659e25">Name</th>
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<th class="entry" align="center" valign="top" width="10%" id="d2659e27">Pin</th>
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<th class="entry" align="center" valign="top" width="80%" id="d2659e29">Description</th>
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</tr>
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</thead>
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<tbody class="tbody"><tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">TCK</td>
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<td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">1</td>
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<td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Test Clock (clock signal from the <span class="ph">Atmel-ICE</span> into the target device).</td>
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</tr>
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<tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">TMS</td>
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<td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">5</td>
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<td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Test Mode Select (control signal from the <span class="ph">Atmel-ICE</span> into the target device).</td>
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</tr>
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<tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">TDI</td>
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<td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">9</td>
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<td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Test Data In (data transmitted from the <span class="ph">Atmel-ICE</span> into the target device).</td>
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</tr>
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<tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">TDO</td>
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<td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">3</td>
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<td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Test Data Out (data transmitted from the target device into
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the <span class="ph">Atmel-ICE</span>).</td>
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</tr>
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<tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">nTRST</td>
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<td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">8</td>
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<td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Test Reset (optional, only on some AVR devices). Used to
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reset the JTAG TAP controller.</td>
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</tr>
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<tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">nSRST</td>
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<td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">6</td>
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<td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Reset (optional). Used to reset the target device.
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Connecting this pin is recommended since it allows the <span class="ph">Atmel-ICE</span> to hold the target device in a reset state, which
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can be essential to debugging in certain scenarios.</td>
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</tr>
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<tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">VTG</td>
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<td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">4</td>
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<td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Target voltage reference. The <span class="ph">Atmel-ICE</span>
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samples the target voltage on this pin in order to power the level converters
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correctly. The <span class="ph">Atmel-ICE</span> draws less than 3mA from this pin
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in debugWIRE mode and less than 1mA in other modes.</td>
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</tr>
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<tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">GND</td>
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<td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">2, 10</td>
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<td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Ground. Both must be connected to ensure that the <span class="ph">Atmel-ICE</span> and the target device share the same ground
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reference.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="p">
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<div class="note tip" id="GUID-27BF3A3E-B61E-485F-8816-EBB7F5642827__GUID-90633520-0AC7-4879-B1E5-B3D962BB674E"><span class="tiptitle">Tip:</span> Remember to include a
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decoupling capacitor between pin 4 and GND.</div>
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</div>
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</div>
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<div class="related-links">
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="GUID-65DB1D01-A0F5-4A46-8ED3-F9D918DEFA43.html">JTAG Physical Interface</a></div>
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</div>
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</div>
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