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<a name="1204412"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">13 ST20C1 specific features</font>
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<a name="1204413"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">OS20 has many features, some of which depend on a timer peripheral being present, for example, functions such as <font size=2 face=Courier><strong>semaphore_wait_timeout()</strong></font> and <font size=2 face=Courier><strong>time_now()</strong></font>.</font>
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<a name="1204414"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The ST20C1 core does not have a built-in timer peripheral. In order for the ST20C1 version of OS20 to provide the full API, you need to incorporate a timer plug-in module into any applications built for the ST20C1 cores. Plug-in modules are board-specific; the interface is generic enough to allow OS20 to take advantage of any timer peripherals that are present.</font>
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<a name="1204415"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">OS20 can be used with or without the plug-in module, however, when accessing timer-related functions without a plug-in module present, a runtime error occurs, so take care when not using the plug-in module.</font>
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<a name="1204675"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Internally, OS20 uses a standardized low level timer API, which accesses functions provided by the plug-in module via function pointers; see <a href="c1.htm#1204690"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Figure⌨️ 快捷键说明
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