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<!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">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="CLC.htm"> CLC Clear Carry Flag</A><BR><B>next:</B><A HREF="CLI.htm"> CLI Clear Interrupt Flag</A><P><HR><P><H1>CLD -- Clear Direction Flag</H1><PRE>Opcode Instruction Clocks DescriptionFC 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">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="CLC.htm"> CLC Clear Carry Flag</A><BR><B>next:</B><A HREF="CLI.htm"> CLI Clear Interrupt Flag</A></BODY>?? 快捷鍵說明
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