117 lines
5.3 KiB
HTML
117 lines
5.3 KiB
HTML
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<!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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<!-- Copyright (C) 1988-2016 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 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): MSP430 Variable Attributes</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): MSP430 Variable Attributes">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): MSP430 Variable Attributes">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Variable-Attributes.html#Variable-Attributes" rel="up" title="Variable Attributes">
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<link href="PowerPC-Variable-Attributes.html#PowerPC-Variable-Attributes" rel="next" title="PowerPC Variable Attributes">
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<link href="Microsoft-Windows-Variable-Attributes.html#Microsoft-Windows-Variable-Attributes" rel="prev" title="Microsoft Windows Variable Attributes">
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="MSP430-Variable-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="PowerPC-Variable-Attributes.html#PowerPC-Variable-Attributes" accesskey="n" rel="next">PowerPC Variable Attributes</a>, Previous: <a href="Microsoft-Windows-Variable-Attributes.html#Microsoft-Windows-Variable-Attributes" accesskey="p" rel="prev">Microsoft Windows Variable Attributes</a>, Up: <a href="Variable-Attributes.html#Variable-Attributes" accesskey="u" rel="up">Variable Attributes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="MSP430-Variable-Attributes-1"></a>
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<h4 class="subsection">6.32.9 MSP430 Variable Attributes</h4>
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<dl compact="compact">
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<dt><code>noinit</code></dt>
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<dd><a name="index-noinit-variable-attribute_002c-MSP430"></a>
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<p>Any data with the <code>noinit</code> attribute will not be initialised by
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the C runtime startup code, or the program loader. Not initialising
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data in this way can reduce program startup times.
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</p>
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</dd>
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<dt><code>persistent</code></dt>
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<dd><a name="index-persistent-variable-attribute_002c-MSP430"></a>
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<p>Any variable with the <code>persistent</code> attribute will not be
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initialised by the C runtime startup code. Instead its value will be
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set once, when the application is loaded, and then never initialised
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again, even if the processor is reset or the program restarts.
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Persistent data is intended to be placed into FLASH RAM, where its
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value will be retained across resets. The linker script being used to
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create the application should ensure that persistent data is correctly
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placed.
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</p>
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</dd>
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<dt><code>lower</code></dt>
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<dt><code>upper</code></dt>
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<dt><code>either</code></dt>
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<dd><a name="index-lower-variable-attribute_002c-MSP430"></a>
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<a name="index-upper-variable-attribute_002c-MSP430"></a>
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<a name="index-either-variable-attribute_002c-MSP430"></a>
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<p>These attributes are the same as the MSP430 function attributes of the
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same name (see <a href="MSP430-Function-Attributes.html#MSP430-Function-Attributes">MSP430 Function Attributes</a>).
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These attributes can be applied to both functions and variables.
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</p></dd>
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</dl>
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</body>
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</html>
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