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<td width="20%">Type:</td><td>UnquotedString</td>
</tr>
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<td width="20%">Destination:</td><td>system_h_define</td>
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<td width="20%">Description:</td><td>Slave descriptor of the system clock timer device. This device provides a periodic interrupt ("tick") and is typically required for RTOS use. This setting defines the value of ALT_SYS_CLK in system.h.</td>
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<td width="20%">Restrictions:</td><td>none</td>
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</table>
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