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study/Ref-docs/manual Intel386/I386Manual/CLD.HTM Normal file
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<html><!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html>
<head>
<title>80386 Programmer's Reference Manual -- Opcode CLD</title>
</head>
<body>
<b>up:</b> <a href="C17.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/C17.HTM">Chapter 17 -- 80386 Instruction Set</a><br>
<b>prev:</b><a href="CLC.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/CLC.HTM"> CLC Clear Carry Flag</a><br>
<b>next:</b><a href="CLI.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/CLI.HTM"> CLI Clear Interrupt Flag</a>
<p>
<hr>
<p>
<h1>CLD -- Clear Direction Flag</h1>
<pre>
Opcode Instruction Clocks Description
FC CLD 2 Clear direction flag; SI and DI
will increment during string
instructions
</pre>
<h2>Operation</h2>
<pre>
DF := 0;
</pre>
<h2>Description</h2>
CLD clears the direction flag. No other flags or registers are affected. After CLD is executed, string operations will increment the index registers (SI and/or DI) that they use.
<h2>Flags Affected</h2>
DF := 0
<h2>Protected Mode Exceptions</h2>
None
<h2>Real Address Mode Exceptions</h2>
None
<h2>Virtual 8086 Mode Exceptions</h2>
None
<p>
<hr>
<p><b>up:</b> <a href="C17.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/C17.HTM">Chapter 17 -- 80386 Instruction Set</a><br>
<b>prev:</b><a href="CLC.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/CLC.HTM"> CLC Clear Carry Flag</a><br>
<b>next:</b><a href="CLI.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/CLI.HTM"> CLI Clear Interrupt Flag</a>
</body>