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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>IO File</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>IO File<br>
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<small>
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[<a class="el" href="group__pavr__hwres.html">Hardware resources</a>]</small>
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</h1><table border=0 cellpadding=0 cellspacing=0>
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<tr><td colspan=2><br><h2>Modules</h2></td></tr>
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<tr><td nowrap align=right valign=top><a class="el" href="group__pavr__hwres__iof__gen.html">General IO port</a></td></tr>
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<tr><td nowrap align=right valign=top><a class="el" href="group__pavr__hwres__iof__sregwr.html">SREG port</a></td></tr>
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<tr><td nowrap align=right valign=top><a class="el" href="group__pavr__hwres__iof__spwr.html">SP port</a></td></tr>
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<tr><td nowrap align=right valign=top><a class="el" href="group__pavr__hwres__iof__rampxwr.html">RAMPX port</a></td></tr>
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<tr><td nowrap align=right valign=top><a class="el" href="group__pavr__hwres__iof__rampywr.html">RAMPY port</a></td></tr>
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<tr><td nowrap align=right valign=top><a class="el" href="group__pavr__hwres__iof__rampzwr.html">RAMPZ port</a></td></tr>
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<tr><td nowrap align=right valign=top><a class="el" href="group__pavr__hwres__iof__rampdwr.html">RAMPD port</a></td></tr>
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<tr><td nowrap align=right valign=top><a class="el" href="group__pavr__hwres__iof__eindwr.html">EIND port</a></td></tr>
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<tr><td nowrap align=right valign=top><a class="el" href="group__pavr__hwres__iof__perif.html">Peripherals</a></td></tr>
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</table>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
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The IO File is composed of a set of discrete registers, that are grouped into a memory-like entity. The IO File has a general write/read port that is byte-oriented, and separate read and write ports for each register in the IO File. <br>
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<br>
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<div align="center">
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<img src="pavr_hwres_iof_01.gif" alt="pavr_hwres_iof_01.gif">
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</div>
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<br>
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Each IO File register is assigned a unique address in the IO space. That address is defined in the in the constants definition file (`pavr-constants.vhd'). <br>
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The IO space is placed in the Unified Memory just above the RF, that is, starting with address 32. <br>
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The IO addressing space range is 0...63 (Unified Memory addresses 32...95). <br>
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Undefined IO registers will read an undefined value. <br>
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<br>
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<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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