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| Previous: <a rel="previous" accesskey="p" href="H8_002f300-Directives.html#H8_002f300-Directives">H8/300 Directives</a>, |
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| <h4 class="subsection">9.14.5 Opcodes</h4> |
| |
| <p><a name="index-H8_002f300-opcode-summary-1060"></a><a name="index-opcode-summary_002c-H8_002f300-1061"></a><a name="index-mnemonics_002c-H8_002f300-1062"></a><a name="index-instruction-summary_002c-H8_002f300-1063"></a>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><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_002f300-1064"></a><a name="index-H8_002f300-size-suffixes-1065"></a>Four H8/300 instructions (<code>add</code>, <code>cmp</code>, <code>mov</code>, |
| <code>sub</code>) are defined with variants using the suffixes ‘<samp><span class="samp">.b</span></samp>’, |
| ‘<samp><span class="samp">.w</span></samp>’, and ‘<samp><span class="samp">.l</span></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>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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