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<title>Using as: D10V-Regs</title>
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<a name="D10V_002dRegs"></a>
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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> [<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>
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<h4 class="subsubsection">9.9.2.4 Register Names</h4>
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<a name="index-D10V-registers"></a>
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<a name="index-registers_002c-D10V"></a>
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<p>You can use the predefined symbols ‘<samp>r0</samp>’ through ‘<samp>r15</samp>’ to refer to the D10V
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registers. You can also use ‘<samp>sp</samp>’ as an alias for ‘<samp>r15</samp>’. The accumulators
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are ‘<samp>a0</samp>’ and ‘<samp>a1</samp>’. There are special register-pair names that may
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optionally be used in opcodes that require even-numbered registers. Register names are
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not case sensitive.
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</p>
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<p>Register Pairs
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</p><dl compact="compact">
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<dt><code>r0-r1</code></dt>
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<dt><code>r2-r3</code></dt>
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<dt><code>r4-r5</code></dt>
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<dt><code>r6-r7</code></dt>
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<dt><code>r8-r9</code></dt>
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<dt><code>r10-r11</code></dt>
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<dt><code>r12-r13</code></dt>
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<dt><code>r14-r15</code></dt>
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</dl>
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<p>The D10V also has predefined symbols for these control registers and status bits:
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</p><dl compact="compact">
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<dt><code>psw</code></dt>
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<dd><p>Processor Status Word
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</p></dd>
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<dt><code>bpsw</code></dt>
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<dd><p>Backup Processor Status Word
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</p></dd>
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<dt><code>pc</code></dt>
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<dd><p>Program Counter
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</p></dd>
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<dt><code>bpc</code></dt>
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<dd><p>Backup Program Counter
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</p></dd>
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<dt><code>rpt_c</code></dt>
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<dd><p>Repeat Count
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</p></dd>
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<dt><code>rpt_s</code></dt>
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<dd><p>Repeat Start address
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</p></dd>
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<dt><code>rpt_e</code></dt>
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<dd><p>Repeat End address
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</p></dd>
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<dt><code>mod_s</code></dt>
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<dd><p>Modulo Start address
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</p></dd>
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<dt><code>mod_e</code></dt>
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<dd><p>Modulo End address
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</p></dd>
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<dt><code>iba</code></dt>
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<dd><p>Instruction Break Address
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</p></dd>
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<dt><code>f0</code></dt>
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<dd><p>Flag 0
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</p></dd>
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<dt><code>f1</code></dt>
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<dd><p>Flag 1
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</p></dd>
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<dt><code>c</code></dt>
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<dd><p>Carry flag
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</p></dd>
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</dl>
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