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<!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 definedwith the keyword MACRO, the macro body, and a final ENDM (end macro)instruction.</P><P><STRONG><PRE> <macro name> MACRO <body line 1> <body line 2> . . <body line m> 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 kindsof 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 ENDMinstruction.<BR>Macros must be defined, before they can be called. Forward references tomacros are not allowed. Once defined, a macro can be called by its name inthe subsequent program as often as desired. Whenever a macro is called, themacro body will be "inserted" into the program and then assembled as normalsource 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
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