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93 lines
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93 lines
3.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 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 1.3
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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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<head>
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<title>AVR-Regs (Using as)</title>
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="AVR-Syntax.html#AVR-Syntax" rel="up" title="AVR Syntax">
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<link href="AVR_002dModifiers.html#AVR_002dModifiers" rel="next" title="AVR-Modifiers">
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<link href="AVR_002dChars.html#AVR_002dChars" rel="prev" title="AVR-Chars">
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<a name="AVR_002dRegs"></a>
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<div class="header">
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<p>
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Next: <a href="AVR_002dModifiers.html#AVR_002dModifiers" accesskey="n" rel="next">AVR-Modifiers</a>, Previous: <a href="AVR_002dChars.html#AVR_002dChars" accesskey="p" rel="prev">AVR-Chars</a>, Up: <a href="AVR-Syntax.html#AVR-Syntax" accesskey="u" rel="up">AVR 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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</div>
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<hr>
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<a name="Register-Names-4"></a>
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<h4 class="subsubsection">9.5.2.2 Register Names</h4>
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<a name="index-AVR-register-names"></a>
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<a name="index-register-names_002c-AVR"></a>
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<p>The AVR has 32 x 8-bit general purpose working registers ‘<samp>r0</samp>’,
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‘<samp>r1</samp>’, ... ‘<samp>r31</samp>’.
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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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‘<samp>X</samp>’, ‘<samp>Y</samp>’ and ‘<samp>Z</samp>’ - registers.
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</p>
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<div class="smallexample">
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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></div>
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