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| <title>Using as: H8/300 Opcodes</title> |
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| <a name="Opcodes-7"></a> |
| <h4 class="subsection">9.12.5 Opcodes</h4> |
| |
| <a name="index-H8_002f300-opcode-summary"></a> |
| <a name="index-opcode-summary_002c-H8_002f300"></a> |
| <a name="index-mnemonics_002c-H8_002f300"></a> |
| <a name="index-instruction-summary_002c-H8_002f300"></a> |
| <p>For detailed information on the H8/300 machine instruction set, see |
| <cite>H8/300 Series Programming Manual</cite>. For information specific to |
| the H8/300H, see <cite>H8/300H Series Programming Manual</cite> (Renesas). |
| </p> |
| <p><code>as</code> implements all the standard H8/300 opcodes. No additional |
| pseudo-instructions are needed on this family. |
| </p> |
| |
| <a name="index-size-suffixes_002c-H8_002f300"></a> |
| <a name="index-H8_002f300-size-suffixes"></a> |
| <p>Four H8/300 instructions (<code>add</code>, <code>cmp</code>, <code>mov</code>, |
| <code>sub</code>) are defined with variants using the suffixes ‘<samp>.b</samp>’, |
| ‘<samp>.w</samp>’, and ‘<samp>.l</samp>’ 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> |
| <p>For example, since <code>r0</code> refers to a 16-bit register, |
| </p><div class="example"> |
| <pre class="example">mov r0,@foo |
| </pre><pre class="example">is equivalent to |
| </pre><pre class="example">mov.w r0,@foo |
| </pre></div> |
| |
| <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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