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CMC.htm
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CMC.htm
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
<HEAD>
<TITLE>80386 Programmer's Reference Manual -- Opcode CMC</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="CLTS.htm"> CLTS Clear Task-Switched Flag in CR0</A><BR>
<B>next:</B><A HREF="CMP.htm"> CMP Compare Two Operands</A>
<P>
<HR>
<P>
<H1>CMC -- Complement Carry Flag</H1>
<PRE>
Opcode Instruction Clocks Description
F5 CMC 2 Complement carry flag
</PRE>
<H2>Operation</H2>
<PRE>
CF := NOT CF;
</PRE>
<H2>Description</H2>
CMC reverses the setting of the carry flag. No other flags are affected.
<H2>Flags Affected</H2>
CF as described above
<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="CLTS.htm"> CLTS Clear Task-Switched Flag in CR0</A><BR>
<B>next:</B><A HREF="CMP.htm"> CMP Compare Two Operands</A>
</BODY>