repeat.htm

来自「一份51的编译程序,dos版本的. 英文名字MCS-51 Microcontr」· HTM 代码 · 共 103 行

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<!-- Repeat Macros -->

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<TITLE>Repeat Macros</TITLE>

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<P>
<STRONG><U>III.11.3 Repeat Macros</U></STRONG>
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<P>
Repeat macros don't have a macro name, and therefore cannot be called
multiple times. They are always expanded immediately after their definition.
During expansion, their macro body is repeated n times (0 &lt;= n &lt;= 65535).
Repeat macros start with the keyword REPT, followed by an expression, which
must be known on <NOBR>pass 1</NOBR>. In analogy to callable macros, there is a macro
body, which must be terminated with an ENDM instruction:
</P>

<P>
<BLOCKQUOTE>
<STRONG><PRE>
REPT &lt;expression&gt;
&lt;body line 1&gt;
&lt;body line 2&gt;
    .
    .
&lt;body line m&gt;
ENDM
</PRE></STRONG>
</BLOCKQUOTE>
</P>

<P>
The expression value specifies how many times the macro body is to be
repeated. Since repeat macros start with the keyword REPT, they are
sometimes also called &quot;REPT blocks&quot;.
</P>

<P>
<BR>
<STRONG>Example:</STRONG>
<BLOCKQUOTE>
<PRE>
        REPT 5
        NOP
        ENDM
</PRE>
This REPT block will expand to five NOP instructions
immediately after its definition:
<PRE>
        NOP
        NOP
        NOP
        NOP
        NOP
</PRE>
</BLOCKQUOTE>
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