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<title>Using as: Z8000-Regs</title>
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<a name="Z8000_002dRegs"></a>
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<a name="Register-Names-18"></a>
<h4 class="subsubsection">9.47.2.2 Register Names</h4>
<a name="index-Z8000-registers"></a>
<a name="index-registers_002c-Z8000"></a>
<p>The Z8000 has sixteen 16 bit registers, numbered 0 to 15. You can refer
to different sized groups of registers by register number, with the
prefix &lsquo;<samp>r</samp>&rsquo; for 16 bit registers, &lsquo;<samp>rr</samp>&rsquo; for 32 bit registers and
&lsquo;<samp>rq</samp>&rsquo; for 64 bit registers. You can also refer to the contents of
the first eight (of the sixteen 16 bit registers) by bytes. They are
named &lsquo;<samp>rl<var>n</var></samp>&rsquo; and &lsquo;<samp>rh<var>n</var></samp>&rsquo;.
</p>
<div class="smallexample">
<pre class="smallexample"><em>byte registers</em>
</pre><pre class="smallexample">rl0 rh0 rl1 rh1 rl2 rh2 rl3 rh3
rl4 rh4 rl5 rh5 rl6 rh6 rl7 rh7
</pre><pre class="smallexample"><em>word registers</em>
</pre><pre class="smallexample">r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r14 r15
</pre><pre class="smallexample"><em>long word registers</em>
</pre><pre class="smallexample">rr0 rr2 rr4 rr6 rr8 rr10 rr12 rr14
</pre><pre class="smallexample"><em>quad word registers</em>
</pre><pre class="smallexample">rq0 rq4 rq8 rq12
</pre></div>
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