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<h5 class="subsubsection">9.4.2.2 Register Names</h5>

<p><a name="index-AVR-register-names-673"></a><a name="index-register-names_002c-AVR-674"></a>
The AVR has 32 x 8-bit general purpose working registers &lsquo;<samp><span class="samp">r0</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">r1</span></samp>&rsquo;, ... &lsquo;<samp><span class="samp">r31</span></samp>&rsquo;. 
Six of the 32 registers can be used as three 16-bit indirect address
register pointers for Data Space addressing. One of the these address
pointers can also be used as an address pointer for look up tables in
Flash program memory. These added function registers are the 16-bit
&lsquo;<samp><span class="samp">X</span></samp>&rsquo;, &lsquo;<samp><span class="samp">Y</span></samp>&rsquo; and &lsquo;<samp><span class="samp">Z</span></samp>&rsquo; - registers.

<pre class="smallexample">     X = <span class="roman">r26:r27</span>
     Y = <span class="roman">r28:r29</span>
     Z = <span class="roman">r30:r31</span>
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