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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>ALU</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>ALU<br> <small> [<a class="el" href="group__pavr__hwres.html">Hardware resources</a>]</small> </h1><table border=0 cellpadding=0 cellspacing=0> </table> <dl compact><dt><b> ALU connectivity:</b><dd> <br> <div align="center"> <img src="pavr_hwres_alu_01.gif" alt="pavr_hwres_alu_01.gif"> </div> <br> <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> <br> The ALU is a 100% <b>combinational</b> device. <br> It accepts 2 operands: <ul> <li> a 16 bit operand <br> This is taken through the Bypass Unit. <li> an 8 bit operand <br> This is taken through the Bypass Unit. </ul> The ALU output is 16 bits wide. <br> </dl><dl compact><dt><b> ALU opcodes:</b><dd> <ul> <li>NOP <br> <li>OP1 <br> Transfers operand 1 directly to the ALU output. <br> OP2 <br> Transfers operand 2 directly to the lower 8 bits of ALU output. <br> <li>ADD8 <br> ADC8 <br> Adds with carry lower 8 bits of operand 1 with operand 2. <br> SUB8 <br> SBC8 <br> <li>AND8 <br> EOR8 <br> OR8 <br> <li>INC8 <br> DEC8 <br> <li>COM8 <br> NEG8 <br> SWAP8 <br> <li>LSR8 <br> ASR8 <br> ROR8 <br> <li>ADD16 <br> Adds without carry operand 1 with operand 2 sign extended to 16 bits. <br> SUB16 <br> <li>MUL8 <br> MULS8 <br> MULSU8 <br> FMUL8 <br> FMULS8 <br> FMULSU8 <br> </ul> </dl><dl compact><dt><b> ALU flags:</b><dd> <ul> <li>H (half carry)<li>S (sign)<li>V (two's complement)<li>N (negative)<li>Z (zero)<li>C (carry) </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>