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107 lines
4.5 KiB
HTML
107 lines
4.5 KiB
HTML
4 years ago
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<!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) 1991-2019 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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section entitled "GNU Free Documentation License".
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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>H8/300 Opcodes (Using as)</title>
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<meta name="description" content="H8/300 Opcodes (Using as)">
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<meta name="keywords" content="H8/300 Opcodes (Using as)">
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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="H8_002f300_002dDependent.html#H8_002f300_002dDependent" rel="up" title="H8/300-Dependent">
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<link href="HPPA_002dDependent.html#HPPA_002dDependent" rel="next" title="HPPA-Dependent">
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<link href="H8_002f300-Directives.html#H8_002f300-Directives" rel="prev" title="H8/300 Directives">
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</head>
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<body lang="en">
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<a name="H8_002f300-Opcodes"></a>
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<div class="header">
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<p>
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Previous: <a href="H8_002f300-Directives.html#H8_002f300-Directives" accesskey="p" rel="prev">H8/300 Directives</a>, Up: <a href="H8_002f300_002dDependent.html#H8_002f300_002dDependent" accesskey="u" rel="up">H8/300-Dependent</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="Opcodes-7"></a>
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<h4 class="subsection">9.13.5 Opcodes</h4>
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<a name="index-H8_002f300-opcode-summary"></a>
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<a name="index-opcode-summary_002c-H8_002f300"></a>
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<a name="index-mnemonics_002c-H8_002f300"></a>
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<a name="index-instruction-summary_002c-H8_002f300"></a>
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<p>For detailed information on the H8/300 machine instruction set, see
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<cite>H8/300 Series Programming Manual</cite>. For information specific to
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the H8/300H, see <cite>H8/300H Series Programming Manual</cite> (Renesas).
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</p>
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<p><code>as</code> implements all the standard H8/300 opcodes. No additional
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pseudo-instructions are needed on this family.
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</p>
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<a name="index-size-suffixes_002c-H8_002f300"></a>
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<a name="index-H8_002f300-size-suffixes"></a>
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<p>Four H8/300 instructions (<code>add</code>, <code>cmp</code>, <code>mov</code>,
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<code>sub</code>) are defined with variants using the suffixes ‘<samp>.b</samp>’,
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‘<samp>.w</samp>’, and ‘<samp>.l</samp>’ to specify the size of a memory operand.
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<code>as</code> supports these suffixes, but does not require them;
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since one of the operands is always a register, <code>as</code> can
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deduce the correct size.
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</p>
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<p>For example, since <code>r0</code> refers to a 16-bit register,
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</p><div class="example">
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<pre class="example">mov r0,@foo
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</pre><pre class="example">is equivalent to
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</pre><pre class="example">mov.w r0,@foo
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</pre></div>
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<p>If you use the size suffixes, <code>as</code> issues a warning when
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the suffix and the register size do not match.
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</p>
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</body>
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</html>
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