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64 lines
2.8 KiB
HTML
64 lines
2.8 KiB
HTML
15 years ago
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<title>AVR-Regs - Using as</title>
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<link title="Top" rel="start" href="index.html#Top">
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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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<link rel="next" href="AVR_002dModifiers.html#AVR_002dModifiers" title="AVR-Modifiers">
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<!--
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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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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.1
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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span.roman { font-family: serif; font-weight: normal; }
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<body>
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<div class="node">
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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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<hr><br>
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</div>
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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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</body></html>
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