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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
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<title>X port</title>
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<link href="doxygen.css" rel="stylesheet" type="text/css">
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</head><body>
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<!-- Generated by Doxygen 1.2.16 -->
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<center>
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<a class="qindex" href="main.html">Main Page</a> <a class="qindex" href="modules.html">Modules</a> <a class="qindex" href="pages.html">Related Pages</a> </center>
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<hr><h1>X port<br>
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<small>
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[<a class="el" href="group__pavr__hwres__rf.html">Register File</a>]</small>
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</h1><table border=0 cellpadding=0 cellspacing=0>
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</table>
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<dl compact><dt><b>
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X port connectivity</b><dd>
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<br>
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<div align="center">
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<img src="pavr_hwres_rf_xwr_01.gif" alt="pavr_hwres_rf_xwr_01.gif">
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</div>
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<br>
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This is a read and write port. <br>
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The contents of the X register is permanently available for reading, under the name `pavr_rf_x'. <br>
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The X write port consists of a data in (pavr_rf_x_di) and a write strobe (pavr_rf_x_wr). </dl><dl compact><dt><b>
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Requests to X write port</b><dd>
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<ul>
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<li>pavr_s5_ldstincrampx_xwr_rq <br>
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Increment X. <br>
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If the controller has more than 64KB memory, than increment RAMPX:X (24 bits) rather than X (16 bits). <br>
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Needed by loads and stores with postincrement. <br>
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<li>pavr_s5_ldstdecrampx_xwr_rq <br>
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Decrement X. <br>
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If more than 64KB memory, than decrement RAMPX:X rather than X. <br>
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Needed by loads and stores with predecrement. <br>
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<br>
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</ul>
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</dl><hr><address align="right"><small>Generated on Tue Dec 31 20:26:30 2002 for Pipelined AVR microcontroller by
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<a href="http://www.doxygen.org/index.html">
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<img src="doxygen.png" alt="doxygen" align="middle" border=0
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width=110 height=53></a>1.2.16 </small></address>
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</body>
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</html>
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