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76 lines
3.9 KiB
HTML
76 lines
3.9 KiB
HTML
4 years ago
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<title>H8/300-Addressing - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="H8_002f300-Syntax.html#H8_002f300-Syntax" title="H8/300 Syntax">
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<link rel="prev" href="H8_002f300_002dRegs.html#H8_002f300_002dRegs" title="H8/300-Regs">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 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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</head>
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<body>
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<div class="node">
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<a name="H8%2f300-Addressing"></a>
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<a name="H8_002f300_002dAddressing"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="H8_002f300_002dRegs.html#H8_002f300_002dRegs">H8/300-Regs</a>,
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Up: <a rel="up" accesskey="u" href="H8_002f300-Syntax.html#H8_002f300-Syntax">H8/300 Syntax</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.12.2.3 Addressing Modes</h5>
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<p><a name="index-addressing-modes_002c-H8_002f300-951"></a><a name="index-H8_002f300-addressing-modes-952"></a>as understands the following addressing modes for the H8/300:
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<dl>
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<dt><code>r</code><var>n</var><dd>Register direct
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<br><dt><code>@r</code><var>n</var><dd>Register indirect
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<br><dt><code>@(</code><var>d</var><code>, r</code><var>n</var><code>)</code><dt><code>@(</code><var>d</var><code>:16, r</code><var>n</var><code>)</code><dt><code>@(</code><var>d</var><code>:24, r</code><var>n</var><code>)</code><dd>Register indirect: 16-bit or 24-bit displacement <var>d</var> from register
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<var>n</var>. (24-bit displacements are only meaningful on the H8/300H.)
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<br><dt><code>@r</code><var>n</var><code>+</code><dd>Register indirect with post-increment
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<br><dt><code>@-r</code><var>n</var><dd>Register indirect with pre-decrement
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<br><dt><code>@</code><var>aa</var><dt><code>@</code><var>aa</var><code>:8</code><dt><code>@</code><var>aa</var><code>:16</code><dt><code>@</code><var>aa</var><code>:24</code><dd>Absolute address <code>aa</code>. (The address size ‘<samp><span class="samp">:24</span></samp>’ only makes
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sense on the H8/300H.)
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<br><dt><code>#</code><var>xx</var><dt><code>#</code><var>xx</var><code>:8</code><dt><code>#</code><var>xx</var><code>:16</code><dt><code>#</code><var>xx</var><code>:32</code><dd>Immediate data <var>xx</var>. You may specify the ‘<samp><span class="samp">:8</span></samp>’, ‘<samp><span class="samp">:16</span></samp>’, or
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‘<samp><span class="samp">:32</span></samp>’ for clarity, if you wish; but <code>as</code> neither
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requires this nor uses it—the data size required is taken from
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context.
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<br><dt><code>@@</code><var>aa</var><dt><code>@@</code><var>aa</var><code>:8</code><dd>Memory indirect. You may specify the ‘<samp><span class="samp">:8</span></samp>’ for clarity, if you
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wish; but <code>as</code> neither requires this nor uses it.
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</dl>
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</body></html>
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