114 lines
5.1 KiB
HTML
114 lines
5.1 KiB
HTML
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<head>
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<title>Using the GNU Compiler Collection (GCC): MSP430 Built-in Functions</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): MSP430 Built-in Functions">
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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="Target-Builtins.html#Target-Builtins" rel="up" title="Target Builtins">
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<link href="NDS32-Built_002din-Functions.html#NDS32-Built_002din-Functions" rel="next" title="NDS32 Built-in Functions">
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<link href="Other-MIPS-Built_002din-Functions.html#Other-MIPS-Built_002din-Functions" rel="prev" title="Other MIPS Built-in Functions">
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<a name="MSP430-Built_002din-Functions"></a>
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<p>
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Next: <a href="NDS32-Built_002din-Functions.html#NDS32-Built_002din-Functions" accesskey="n" rel="next">NDS32 Built-in Functions</a>, Previous: <a href="Other-MIPS-Built_002din-Functions.html#Other-MIPS-Built_002din-Functions" accesskey="p" rel="prev">Other MIPS Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</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-Built_002din-Functions-1"></a>
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<h4 class="subsection">6.59.17 MSP430 Built-in Functions</h4>
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<p>GCC provides a couple of special builtin functions to aid in the
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writing of interrupt handlers in C.
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</p>
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<dl compact="compact">
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<dt><code>__bic_SR_register_on_exit (int <var>mask</var>)</code></dt>
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<dd><p>This clears the indicated bits in the saved copy of the status register
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currently residing on the stack. This only works inside interrupt
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handlers and the changes to the status register will only take affect
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once the handler returns.
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</p>
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</dd>
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<dt><code>__bis_SR_register_on_exit (int <var>mask</var>)</code></dt>
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<dd><p>This sets the indicated bits in the saved copy of the status register
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currently residing on the stack. This only works inside interrupt
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handlers and the changes to the status register will only take affect
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once the handler returns.
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</p>
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</dd>
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<dt><code>__delay_cycles (long long <var>cycles</var>)</code></dt>
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<dd><p>This inserts an instruction sequence that takes exactly <var>cycles</var>
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cycles (between 0 and about 17E9) to complete. The inserted sequence
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may use jumps, loops, or no-ops, and does not interfere with any other
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instructions. Note that <var>cycles</var> must be a compile-time constant
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integer - that is, you must pass a number, not a variable that may be
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optimized to a constant later. The number of cycles delayed by this
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builtin is exact.
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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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