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Node:<a name="H8%2f300%20Opcodes">H8/300 Opcodes</a>,

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<h4 class="section">Opcodes</h4>



   <p>For detailed information on the H8/300 machine instruction set, see

<cite>H8/300 Series Programming Manual</cite> (Hitachi ADE-602-025).  For

information specific to the H8/300H, see <cite>H8/300H Series

Programming Manual</cite> (Hitachi).



   <p><code>as</code> implements all the standard H8/300 opcodes.  No additional

pseudo-instructions are needed on this family.



   <p>Four H8/300 instructions (<code>add</code>, <code>cmp</code>, <code>mov</code>,

<code>sub</code>) are defined with variants using the suffixes <code>.b</code>,

<code>.w</code>, and <code>.l</code> to specify the size of a memory operand. 

<code>as</code> supports these suffixes, but does not require them;

since one of the operands is always a register, <code>as</code> can

deduce the correct size.



   <p>For example, since <code>r0</code> refers to a 16-bit register,

<pre class="example">     mov    r0,@foo

<br>is equivalent to<br>

     mov.w  r0,@foo

     </pre>



   <p>If you use the size suffixes, <code>as</code> issues a warning when

the suffix and the register size do not match.



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