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  17. <title>AVR JTAG Pinout</title>
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  24. <body id="GUID-27BF3A3E-B61E-485F-8816-EBB7F5642827">
  25. 

  26. <h1 class="title topictitle1">AVR JTAG Pinout</h1>
  27. <div class="body"><p class="p">When designing an application PCB, which includes an Atmel AVR with the
  28.          JTAG interface, it is recommended to use the pinout as shown in the figure below. Both
  29.          100-mil and 50-mil variants of this pinout are supported, depending on the cabling and
  30.          adapters included with the particular kit.</p>
  31. <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>
  32. 

  33. <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>
  34. <th class="entry" align="center" valign="top" width="10%" id="d2659e27">Pin</th>
  35. <th class="entry" align="center" valign="top" width="80%" id="d2659e29">Description</th>
  36. </tr>
  37. </thead>
  38. <tbody class="tbody"><tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">TCK</td>
  39. <td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">1</td>
  40. <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>
  41. </tr>
  42. <tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">TMS</td>
  43. <td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">5</td>
  44. <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>
  45. </tr>
  46. <tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">TDI</td>
  47. <td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">9</td>
  48. <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>
  49. </tr>
  50. <tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">TDO</td>
  51. <td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">3</td>
  52. <td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Test Data Out (data transmitted from the target device into
  53.                      the <span class="ph">Atmel-ICE</span>).</td>
  54. </tr>
  55. <tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">nTRST</td>
  56. <td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">8</td>
  57. <td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Test Reset (optional, only on some AVR devices). Used to
  58.                         reset the JTAG TAP controller.</td>
  59. </tr>
  60. <tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">nSRST</td>
  61. <td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">6</td>
  62. <td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Reset (optional). Used to reset the target device.
  63.                      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
  64.                      can be essential to debugging in certain scenarios.</td>
  65. </tr>
  66. <tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">VTG</td>
  67. <td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">4</td>
  68. <td class="entry" align="left" valign="top" width="80%" headers="d2659e29 ">Target voltage reference. The <span class="ph">Atmel-ICE</span>
  69.                      samples the target voltage on this pin in order to power the level converters
  70.                      correctly. The <span class="ph">Atmel-ICE</span> draws less than 3mA from this pin
  71.                      in debugWIRE mode and less than 1mA in other modes.</td>
  72. </tr>
  73. <tr class="row"><td class="entry" align="left" valign="top" width="10%" headers="d2659e25 ">GND</td>
  74. <td class="entry" align="left" valign="top" width="10%" headers="d2659e27 ">2, 10</td>
  75. <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
  76.                      reference.</td>
  77. </tr>
  78. </tbody>
  79. </table>
  80. </div>
  81. <div class="p">
  82.          <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
  83.             decoupling capacitor between pin 4 and GND.</div>
  84. 

  85.       </div>
  86. </div>
  87. <div class="related-links">
  88. <div class="familylinks">
  89. <div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="GUID-65DB1D01-A0F5-4A46-8ED3-F9D918DEFA43.html">JTAG Physical Interface</a></div>
  90. </div>
  91. </div>
  92. 

  93. </body>
  94. </html>