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83 lines
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83 lines
3.9 KiB
HTML
4 years ago
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<title>MSP430 Built-in Functions - Using the GNU Compiler Collection (GCC)</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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<link rel="up" href="Target-Builtins.html#Target-Builtins" title="Target Builtins">
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<link rel="prev" href="Other-MIPS-Built_002din-Functions.html#Other-MIPS-Built_002din-Functions" title="Other MIPS Built-in Functions">
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<link rel="next" href="NDS32-Built_002din-Functions.html#NDS32-Built_002din-Functions" title="NDS32 Built-in Functions">
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Permission is granted to copy, distribute and/or modify this document
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<body>
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<div class="node">
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<a name="MSP430-Built-in-Functions"></a>
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<a name="MSP430-Built_002din-Functions"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="NDS32-Built_002din-Functions.html#NDS32-Built_002din-Functions">NDS32 Built-in Functions</a>,
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Previous: <a rel="previous" accesskey="p" href="Other-MIPS-Built_002din-Functions.html#Other-MIPS-Built_002din-Functions">Other MIPS Built-in Functions</a>,
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Up: <a rel="up" accesskey="u" href="Target-Builtins.html#Target-Builtins">Target Builtins</a>
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<hr>
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</div>
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<h4 class="subsection">6.58.16 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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<dl>
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<dt><code>__bic_SR_register_on_exit (int </code><var>mask</var><code>)</code><dd>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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<br><dt><code>__bis_SR_register_on_exit (int </code><var>mask</var><code>)</code><dd>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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<br><dt><code>__delay_cycles (long long </code><var>cycles</var><code>)</code><dd>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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</dl>
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</body></html>
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