131 lines
5.7 KiB
HTML
131 lines
5.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2021 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using as: S12Z Syntax Overview</title>
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<meta name="description" content="Using as: S12Z Syntax Overview">
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<meta name="keywords" content="Using as: S12Z Syntax Overview">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="S12Z-Syntax.html#S12Z-Syntax" rel="up" title="S12Z Syntax">
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<link href="S12Z-Addressing-Modes.html#S12Z-Addressing-Modes" rel="next" title="S12Z Addressing Modes">
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<link href="S12Z-Syntax.html#S12Z-Syntax" rel="previous" title="S12Z Syntax">
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="S12Z-Syntax-Overview"></a>
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<div class="header">
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<p>
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Next: <a href="S12Z-Addressing-Modes.html#S12Z-Addressing-Modes" accesskey="n" rel="next">S12Z Addressing Modes</a>, Up: <a href="S12Z-Syntax.html#S12Z-Syntax" accesskey="u" rel="up">S12Z Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Overview-2"></a>
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<h4 class="subsubsection">9.24.2.1 Overview</h4>
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<p>In the S12Z syntax, the instruction name comes first and it may
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be followed by one, or by several operands.
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In most cases the maximum number of operands is three.
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Operands are separated by a comma (‘<samp>,</samp>’).
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A comma however does not act as a separator if it appears within parentheses
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(‘<samp>()</samp>’) or within square brackets (‘<samp>[]</samp>’).
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<code>as</code> will complain if too many, too few or inappropriate operands
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are specified for a given instruction.
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</p>
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<p>Some instructions accept and (in certain situations require) a suffix
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indicating the size of the operand.
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The suffix is separated from the instruction name by a period (‘<samp>.</samp>’)
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and may be one of ‘<samp>b</samp>’, ‘<samp>w</samp>’, ‘<samp>p</samp>’ or ‘<samp>l</samp>’ indicating
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‘byte’ (a single byte), ‘word’ (2 bytes), ‘pointer’ (3 bytes) or ‘long’ (4 bytes)
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respectively.
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</p>
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<p>Example:
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</p>
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<div class="smallexample">
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<pre class="smallexample"> bset.b 0xA98, #5
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mov.b #6, 0x2409
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ld d0, #4
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mov.l (d0, x), 0x2409
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inc d0
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cmp d0, #12
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blt *-4
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lea x, 0x2409
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st y, (1, x)
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</pre></div>
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<a name="index-line-comment-character_002c-S12Z"></a>
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<p>The presence of a ‘<samp>;</samp>’ character anywhere
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on a line indicates the start of a comment that extends to the end of
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that line.
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</p>
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<p>A ‘<samp>*</samp>’ or a ‘<samp>#</samp>’ character at the start of a line also
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introduces a line comment, but these characters do not work elsewhere
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on the line. If the first character of the line is a ‘<samp>#</samp>’ then as
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well as starting a comment, the line could also be logical line number
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directive (see <a href="Comments.html#Comments">Comments</a>) or a preprocessor control command
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(see <a href="Preprocessing.html#Preprocessing">Preprocessing</a>).
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</p>
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<a name="index-line-separator_002c-S12Z"></a>
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<a name="index-statement-separator_002c-S12Z"></a>
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<a name="index-S12Z-line-separator"></a>
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<p>The S12Z assembler does not currently support a line separator
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character.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="S12Z-Addressing-Modes.html#S12Z-Addressing-Modes" accesskey="n" rel="next">S12Z Addressing Modes</a>, Up: <a href="S12Z-Syntax.html#S12Z-Syntax" accesskey="u" rel="up">S12Z Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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