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116 lines
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116 lines
5.2 KiB
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<title>MSP430 Variable Attributes (Using the GNU Compiler Collection (GCC))</title>
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<a name="MSP430-Variable-Attributes"></a>
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Next: <a href="Nvidia-PTX-Variable-Attributes.html#Nvidia-PTX-Variable-Attributes" accesskey="n" rel="next">Nvidia PTX 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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<a name="MSP430-Variable-Attributes-1"></a>
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<h4 class="subsection">6.32.10 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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