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<html><!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html>
<head>
<title>80386 Programmer's Reference Manual -- Opcode NOT</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="NOP.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/NOP.HTM"> NOP No Operation</a><br>
<b>next:</b><a href="OR.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/OR.HTM"> OR Logical Inclusive OR</a>
<p>
<hr>
<p>
<h1>NOT -- One's Complement Negation</h1>
<pre>
Opcode Instruction Clocks Description
F6 /2 NOT r/m8 2/6 Reverse each bit of r/m byte
F7 /2 NOT r/m16 2/6 Reverse each bit of r/m word
F7 /2 NOT r/m32 2/6 Reverse each bit of r/m dword
</pre>
<h2>Operation</h2>
<pre>
r/m := NOT r/m;
</pre>
<h2>Description</h2>
NOT inverts the operand; every 1 becomes a 0, and vice versa.
<h2>Flags Affected</h2>
None
<h2>Protected Mode Exceptions</h2>
#GP(0) if the result is in a nonwritable segment; #GP(0) for an illegal memory operand effective address in the CS, DS, ES, FS, or GS segments; #SS(0) for an illegal address in the SS segment; #PF(fault-code) for a page fault
<h2>Real Address Mode Exceptions</h2>
Interrupt 13 if any part of the operand would lie outside of the effective address space from 0 to 0FFFFH
<h2>Virtual 8086 Mode Exceptions</h2>
Same exceptions as in real-address mode; #PF(fault-code) for a page fault
<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="NOP.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/NOP.HTM"> NOP No Operation</a><br>
<b>next:</b><a href="OR.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/OR.HTM"> OR Logical Inclusive OR</a>
</body>