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<title>Using as: D10V-Regs</title>

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<a name="D10V_002dRegs"></a>
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<p>
Next: <a href="D10V_002dAddressing.html#D10V_002dAddressing" accesskey="n" rel="next">D10V-Addressing</a>, Previous: <a href="D10V_002dChars.html#D10V_002dChars" accesskey="p" rel="prev">D10V-Chars</a>, Up: <a href="D10V_002dSyntax.html#D10V_002dSyntax" accesskey="u" rel="up">D10V-Syntax</a> &nbsp; [<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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<a name="Register-Names-5"></a>
<h4 class="subsubsection">9.9.2.4 Register Names</h4>
<a name="index-D10V-registers"></a>
<a name="index-registers_002c-D10V"></a>
<p>You can use the predefined symbols &lsquo;<samp>r0</samp>&rsquo; through &lsquo;<samp>r15</samp>&rsquo; to refer to the D10V
registers.  You can also use &lsquo;<samp>sp</samp>&rsquo; as an alias for &lsquo;<samp>r15</samp>&rsquo;.  The accumulators
are &lsquo;<samp>a0</samp>&rsquo; and &lsquo;<samp>a1</samp>&rsquo;.  There are special register-pair names that may
optionally be used in opcodes that require even-numbered registers. Register names are
not case sensitive.
</p>
<p>Register Pairs
</p><dl compact="compact">
<dt><code>r0-r1</code></dt>
<dt><code>r2-r3</code></dt>
<dt><code>r4-r5</code></dt>
<dt><code>r6-r7</code></dt>
<dt><code>r8-r9</code></dt>
<dt><code>r10-r11</code></dt>
<dt><code>r12-r13</code></dt>
<dt><code>r14-r15</code></dt>
</dl>

<p>The D10V also has predefined symbols for these control registers and status bits:
</p><dl compact="compact">
<dt><code>psw</code></dt>
<dd><p>Processor Status Word
</p></dd>
<dt><code>bpsw</code></dt>
<dd><p>Backup Processor Status Word
</p></dd>
<dt><code>pc</code></dt>
<dd><p>Program Counter
</p></dd>
<dt><code>bpc</code></dt>
<dd><p>Backup Program Counter
</p></dd>
<dt><code>rpt_c</code></dt>
<dd><p>Repeat Count
</p></dd>
<dt><code>rpt_s</code></dt>
<dd><p>Repeat Start address
</p></dd>
<dt><code>rpt_e</code></dt>
<dd><p>Repeat End address
</p></dd>
<dt><code>mod_s</code></dt>
<dd><p>Modulo Start address
</p></dd>
<dt><code>mod_e</code></dt>
<dd><p>Modulo End address
</p></dd>
<dt><code>iba</code></dt>
<dd><p>Instruction Break Address
</p></dd>
<dt><code>f0</code></dt>
<dd><p>Flag 0
</p></dd>
<dt><code>f1</code></dt>
<dd><p>Flag 1
</p></dd>
<dt><code>c</code></dt>
<dd><p>Carry flag
</p></dd>
</dl>


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