📄 simple.htm

📁 一份51的编译程序,dos版本的. 英文名字MCS-51 Microcontroller Family Macro Assembler

💻 HTM

字号:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<!-- Simple Callable Macros -->

<HTML>

<HEAD>

<TITLE>Simple Callable Macros</TITLE>

</HEAD>

<BODY BACKGROUND="spiral.gif" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#990099" ALINK="#FF0000">

<TABLE WIDTH="98%">
<TR><TD WIDTH=60 VALIGN=BOTTOM NOWRAP>
<IMG SRC="transp.gif" ALT="" WIDTH=60 HEIGHT=20>
</TD><TD>

<!-- Ab hier Seitentext: -->

<BIG>
<BR>

<P>
<STRONG><U>III.11.1 Simple Callable Macros</U></STRONG>
</P>

<P>
Macros must first be defined, before they can be called in a program.
A simple macro definition consists of the macro name, which can be defined
with the keyword MACRO, the macro body, and a final ENDM (end macro)
instruction.
</P>

<P><STRONG>
<PRE>
   &lt;macro name&gt; MACRO
   &lt;body line 1&gt;
   &lt;body line 2&gt;
       .
       .
   &lt;body line m&gt;
   ENDM
</PRE>
</STRONG></P>

<P>
The macro name must be a valid, unique symbol. It cannot be redefined later.
Keywords cannot be used as macro names.<BR>
The macro body may comprise any number of lines. Body lines may be all kinds
of assembler instructions, pseudo instructions, controls, meta instructions,
macro calls and even further macro definitions.<BR>
The macro body and the whole macro definition is terminated with the ENDM
instruction.<BR>
Macros must be defined, before they can be called. Forward references to
macros are not allowed. Once defined, a macro can be called by its name in
the subsequent program as often as desired. Whenever a macro is called, the
macro body will be &quot;inserted&quot; into the program and then assembled as normal
source lines. This process is called macro expansion.
</P>

<P>
<BR>
<STRONG>Example:</STRONG>
<PRE>
        MY_FIRST MACRO  ;definition
        MOV A,#42
        ADD A,R5
        ENDM

        MY_FIRST        ;call
</PRE>
<BLOCKQUOTE>
         After the call of the macro MY_FIRST, the body lines
</BLOCKQUOTE>
<PRE>
        MOV A,#42
        ADD A,R5
</PRE>
<BLOCKQUOTE>
         are inserted into the program and assembled.
</BLOCKQUOTE>
</P>

</BIG>

<!-- Seitentext Ende -->

<P>
<BR>
<BR>
<CENTER>
<TABLE WIDTH="70%">
<TR><TH><A HREF="contents.htm"><IMG SRC="home.gif" ALT="[contents]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH>
    <TH><A HREF="macros.htm"><IMG SRC="up.gif" ALT="[up]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH>
    <TH><A HREF="macros.htm"><IMG SRC="back.gif" ALT="[back]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH>
    <TH><A HREF="params.htm"><IMG SRC="next.gif" ALT="[next]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH>
</TR>
</TABLE>
</CENTER>
</P>

</TD></TR>
</TABLE>

</BODY>

</HTML>

⌨️ 快捷键说明

复制代码 Ctrl + C

搜索代码 Ctrl + F

全屏模式 F11

切换主题 Ctrl + Shift + D

显示快捷键 ?

增大字号 Ctrl + =

减小字号 Ctrl + -