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64 lines
2.8 KiB
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<title>AVR-Regs - Using as</title>
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<link rel="up" href="AVR-Syntax.html#AVR-Syntax" title="AVR Syntax">
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<link rel="prev" href="AVR_002dChars.html#AVR_002dChars" title="AVR-Chars">
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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<p>
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<a name="AVR_002dRegs"></a>Next: <a rel="next" accesskey="n" href="AVR_002dModifiers.html#AVR_002dModifiers">AVR-Modifiers</a>,
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Previous: <a rel="previous" accesskey="p" href="AVR_002dChars.html#AVR_002dChars">AVR-Chars</a>,
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Up: <a rel="up" accesskey="u" href="AVR-Syntax.html#AVR-Syntax">AVR Syntax</a>
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<h5 class="subsubsection">9.4.2.2 Register Names</h5>
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<p><a name="index-AVR-register-names-652"></a><a name="index-register-names_002c-AVR-653"></a>
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The AVR has 32 x 8-bit general purpose working registers <span class="samp">r0</span>,
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<span class="samp">r1</span>, ... <span class="samp">r31</span>.
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Six of the 32 registers can be used as three 16-bit indirect address
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register pointers for Data Space addressing. One of the these address
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pointers can also be used as an address pointer for look up tables in
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Flash program memory. These added function registers are the 16-bit
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<span class="samp">X</span>, <span class="samp">Y</span> and <span class="samp">Z</span> - registers.
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<pre class="smallexample"> X = <span class="roman">r26:r27</span>
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Y = <span class="roman">r28:r29</span>
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Z = <span class="roman">r30:r31</span>
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</pre>
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