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<h5 class="subsubsection">9.26.2.3 Register Names</h5>

<p><a name="index-MSP-430-register-names-1390"></a><a name="index-register-names_002c-MSP-430-1391"></a>General-purpose registers are represented by predefined symbols of the
form &lsquo;<samp><span class="samp">r</span><var>N</var></samp>&rsquo; (for global registers), where <var>N</var> represents
a number between <code>0</code> and <code>15</code>.  The leading
letters may be in either upper or lower case; for example, &lsquo;<samp><span class="samp">r13</span></samp>&rsquo;
and &lsquo;<samp><span class="samp">R7</span></samp>&rsquo; are both valid register names.

   <p><a name="index-special-purpose-registers_002c-MSP-430-1392"></a>Register names &lsquo;<samp><span class="samp">PC</span></samp>&rsquo;, &lsquo;<samp><span class="samp">SP</span></samp>&rsquo; and &lsquo;<samp><span class="samp">SR</span></samp>&rsquo; cannot be used as register names
and will be treated as variables. Use &lsquo;<samp><span class="samp">r0</span></samp>&rsquo;, &lsquo;<samp><span class="samp">r1</span></samp>&rsquo;, and &lsquo;<samp><span class="samp">r2</span></samp>&rsquo; instead.

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