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NOP.htm
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
<HEAD>
<TITLE>80386 Programmer's Reference Manual -- Opcode NOP</TITLE>
</HEAD>
<BODY STYLE="width:80ch">
<B>up:</B> <A HREF="c17.htm">
Chapter 17 -- 80386 Instruction Set</A><BR>
<B>prev:</B><A HREF="NEG.htm"> NEG Two's Complement Negation</A><BR>
<B>next:</B><A HREF="NOT.htm"> NOT One's Complement Negation</A>
<P>
<HR>
<P>
<H1>NOP -- No Operation</H1>
<PRE>
Opcode Instruction Clocks Description
90 NOP 3 No operation
</PRE>
<H2>Description</H2>
NOP performs no operation. NOP is a one-byte instruction that takes
up space but affects none of the machine context except (E)IP.
<P>
NOP is an alias mnemonic for the <A HREF="XCHG.htm">XCHG</A> (E)AX, (E)AX instruction.
<H2>Flags Affected</H2>
None
<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">
Chapter 17 -- 80386 Instruction Set</A><BR>
<B>prev:</B><A HREF="NEG.htm"> NEG Two's Complement Negation</A><BR>
<B>next:</B><A HREF="NOT.htm"> NOT One's Complement Negation</A>
</BODY>