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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>ALU</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>ALU<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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</table>
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<dl compact><dt><b>
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ALU connectivity:</b><dd>
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<br>
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<div align="center">
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<img src="pavr_hwres_alu_01.gif" alt="pavr_hwres_alu_01.gif">
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</div>
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<br>
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<a class="el" href="group__pavr__pipeline__alu.html#alu_pipe_ref_01">Here</a> it can be seen how the ALU plugs into the pipeline. <br>
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<br>
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The ALU is a 100% <b>combinational</b> device. <br>
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It accepts 2 operands: <ul>
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<li> a 16 bit operand <br>
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This is taken through the Bypass Unit. <li> an 8 bit operand <br>
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This is taken through the Bypass Unit. </ul>
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The ALU output is 16 bits wide. <br>
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</dl><dl compact><dt><b>
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ALU opcodes:</b><dd>
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<ul>
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<li>NOP <br>
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<li>OP1 <br>
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Transfers operand 1 directly to the ALU output. <br>
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OP2 <br>
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Transfers operand 2 directly to the lower 8 bits of ALU output. <br>
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<li>ADD8 <br>
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ADC8 <br>
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Adds with carry lower 8 bits of operand 1 with operand 2. <br>
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SUB8 <br>
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SBC8 <br>
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<li>AND8 <br>
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EOR8 <br>
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OR8 <br>
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<li>INC8 <br>
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DEC8 <br>
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<li>COM8 <br>
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NEG8 <br>
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SWAP8 <br>
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<li>LSR8 <br>
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ASR8 <br>
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ROR8 <br>
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<li>ADD16 <br>
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Adds without carry operand 1 with operand 2 sign extended to 16 bits. <br>
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SUB16 <br>
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<li>MUL8 <br>
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MULS8 <br>
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MULSU8 <br>
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FMUL8 <br>
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FMULS8 <br>
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FMULSU8 <br>
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</ul>
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</dl><dl compact><dt><b>
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ALU flags:</b><dd>
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<ul>
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<li>H (half carry)<li>S (sign)<li>V (two's complement)<li>N (negative)<li>Z (zero)<li>C (carry) </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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