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<a name="1205151"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">10.16 Restrictions on interrupt handlers</font>
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<a name="1205152"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Certain restrictions must be kept in mind when using interrupts on the ST20.</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205153"> </a>Descheduling and timeslicing are automatically disabled for interrupt handlers.</font></p>
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<dt> <a name="1205154"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Channel communications (on the ST20C2) and any other descheduling operation are not permitted.</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205155"> </a>On the ST20-C2 interrupt handlers must not use 2D block move functions or instructions unless the existing block move state is explicitly saved and restored by the handler.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1209484"> </a>Interrupt handlers cannot use C++ exception handling, that is, they must not be compiled with the <strong>st20cc</strong> option <font size=2 face=Courier><strong>-exceptions</strong></font>.</font></p>
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