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