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Node:<a name="H8%2f300-Addressing">H8/300-Addressing</a>,

Previous:<a rel="previous" accesskey="p" href="H8-300-Regs.html#H8%2f300-Regs">H8/300-Regs</a>,

Up:<a rel="up" accesskey="u" href="H8-300-Syntax.html#H8%2f300%20Syntax">H8/300 Syntax</a>

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<h5 class="subsection">Addressing Modes</h5>



   as understands the following addressing modes for the H8/300:

     <dl>

<dt><code>r</code><var>n</var><code></code>

     <dd>Register direct



     <br><dt><code>@r</code><var>n</var><code></code>

     <dd>Register indirect



     <br><dt><code>@(</code><var>d</var><code>, r</code><var>n</var><code>)</code>

     <dd><dt><code>@(</code><var>d</var><code>:16, r</code><var>n</var><code>)</code>

     <dd><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

<var>n</var>.  (24-bit displacements are only meaningful on the H8/300H.)



     <br><dt><code>@r</code><var>n</var><code>+</code>

     <dd>Register indirect with post-increment



     <br><dt><code>@-r</code><var>n</var><code></code>

     <dd>Register indirect with pre-decrement



     <br><dt><code>@</code><var>aa</var><code></code>

     <dd><dt><code>@</code><var>aa</var><code>:8</code>

     <dd><dt><code>@</code><var>aa</var><code>:16</code>

     <dd><dt><code>@</code><var>aa</var><code>:24</code>

     <dd>Absolute address <code>aa</code>.  (The address size <code>:24</code> only makes

sense on the H8/300H.)



     <br><dt><code>#</code><var>xx</var><code></code>

     <dd><dt><code>#</code><var>xx</var><code>:8</code>

     <dd><dt><code>#</code><var>xx</var><code>:16</code>

     <dd><dt><code>#</code><var>xx</var><code>:32</code>

     <dd>Immediate data <var>xx</var>.  You may specify the <code>:8</code>, <code>:16</code>, or

<code>:32</code> for clarity, if you wish; but <code>as</code> neither

requires this nor uses it--the data size required is taken from

context.



     <br><dt><code>@@</code><var>aa</var><code></code>

     <dd><dt><code>@@</code><var>aa</var><code>:8</code>

     <dd>Memory indirect.  You may specify the <code>:8</code> for clarity, if you

wish; but <code>as</code> neither requires this nor uses it. 

</dl>



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