48 lines
1.6 KiB
HTML
48 lines
1.6 KiB
HTML
<html><!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
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<html>
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<head>
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<title>80386 Programmer's Reference Manual -- Opcode LAHF</title>
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</head>
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<body>
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<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>
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<b>prev:</b><a href="JMP.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/JMP.HTM"> JMP Jump</a><br>
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<b>next:</b><a href="LAR.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/LAR.HTM"> LAR Load Access Rights Byte</a>
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<p>
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<hr>
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<p>
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<h1>LAHF -- Load Flags into AH Register</h1>
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<pre>
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Opcode Instruction Clocks Description
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9F LAHF 2 Load: AH := flags SF ZF xx AF xx PF xx CF
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</pre>
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<h2>Operation</h2>
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<pre>
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AH := SF:ZF:xx:AF:xx:PF:xx:CF;
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</pre>
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<h2>Description</h2>
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LAHF transfers the low byte of the flags word to AH. The bits, from MSB to LSB, are sign, zero, indeterminate, auxiliary, carry, indeterminate, parity, indeterminate, and carry.
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<h2>Flags Affected</h2>
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None
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<h2>Protected Mode Exceptions</h2>
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None
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<h2>Real Address Mode Exceptions</h2>
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None
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<h2>Virtual 8086 Mode Exceptions</h2>
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None
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<p>
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<hr>
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<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>
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<b>prev:</b><a href="JMP.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/JMP.HTM"> JMP Jump</a><br>
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<b>next:</b><a href="LAR.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/LAR.HTM"> LAR Load Access Rights Byte</a>
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</body>
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