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| <title>Using as: MSP430-Ext</title> |
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| <a name="MSP430_002dExt"></a> |
| <div class="header"> |
| <p> |
| Previous: <a href="MSP430_002dRegs.html#MSP430_002dRegs" accesskey="p" rel="prev">MSP430-Regs</a>, Up: <a href="MSP430-Syntax.html#MSP430-Syntax" accesskey="u" rel="up">MSP430 Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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| <hr> |
| <a name="Assembler-Extensions"></a> |
| <h4 class="subsubsection">9.29.2.4 Assembler Extensions</h4> |
| <a name="index-MSP430-Assembler-Extensions"></a> |
| |
| <dl compact="compact"> |
| <dt><code>@rN</code></dt> |
| <dd><p>As destination operand being treated as ‘<samp>0(rn)</samp>’ |
| </p> |
| </dd> |
| <dt><code>0(rN)</code></dt> |
| <dd><p>As source operand being treated as ‘<samp>@rn</samp>’ |
| </p> |
| </dd> |
| <dt><code>jCOND +N</code></dt> |
| <dd><p>Skips next N bytes followed by jump instruction and equivalent to |
| ‘<samp>jCOND $+N+2</samp>’ |
| </p> |
| </dd> |
| </dl> |
| |
| <p>Also, there are some instructions, which cannot be found in other assemblers. |
| These are branch instructions, which has different opcodes upon jump distance. |
| They all got PC relative addressing mode. |
| </p> |
| <dl compact="compact"> |
| <dt><code>beq label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jeq label</samp>’ in case if jump distance |
| within allowed range for cpu’s jump instruction. If not, this unrolls into |
| a sequence of |
| </p><div class="smallexample"> |
| <pre class="smallexample"> jne $+6 |
| br label |
| </pre></div> |
| |
| </dd> |
| <dt><code>bne label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jne label</samp>’ or ‘<samp>jeq +4; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>blt label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jl label</samp>’ or ‘<samp>jge +4; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>bltn label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jn label</samp>’ or ‘<samp>jn +2; jmp +4; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>bltu label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jlo label</samp>’ or ‘<samp>jhs +2; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>bge label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jge label</samp>’ or ‘<samp>jl +4; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>bgeu label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jhs label</samp>’ or ‘<samp>jlo +4; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>bgt label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jeq +2; jge label</samp>’ or ‘<samp>jeq +6; jl +4; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>bgtu label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jeq +2; jhs label</samp>’ or ‘<samp>jeq +6; jlo +4; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>bleu label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jeq label; jlo label</samp>’ or ‘<samp>jeq +2; jhs +4; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>ble label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jeq label; jl label</samp>’ or ‘<samp>jeq +2; jge +4; br label</samp>’ |
| </p> |
| </dd> |
| <dt><code>jump label</code></dt> |
| <dd><p>A polymorph instruction which is ‘<samp>jmp label</samp>’ or ‘<samp>br label</samp>’ |
| </p></dd> |
| </dl> |
| |
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| Previous: <a href="MSP430_002dRegs.html#MSP430_002dRegs" accesskey="p" rel="prev">MSP430-Regs</a>, Up: <a href="MSP430-Syntax.html#MSP430-Syntax" accesskey="u" rel="up">MSP430 Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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