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<a name="1204456"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">11.2.1 Interrupts and traps</font>
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<p>
<a name="1204460"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The OS20 task awareness extends the concept of a task to encompass interrupts and trap handlers, and these are treated in the same way as tasks. This can be particularly useful in the context of task specific events, for example, to only trigger a breakpoint when a particular interrupt is running.</font>
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<a name="1204461"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Interrupt handlers are given the fixed name:</font>
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<a name="1204462"> </a><font size=2 face=Courier><strong>Interrupt[<font size=2 face=Courier><strong><em>n</em></strong></font>]<br></strong></font>
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<a name="1204463"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">where <font size=2 face=Courier><strong><em>n</em></strong></font> is the interrupt level.</font>
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<a name="1204464"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Trap handler names are different between ST20C1 and ST20C2 cores. On the ST20C2 they are given the name:</font>
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<a name="1204465"> </a><font size=2 face=Courier><strong>Trap[<font size=2 face=Courier><strong><em>priority</em></strong></font>][<font size=2 face=Courier><strong><em>name</em></strong></font>]<br></strong></font>
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<a name="1204466"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">where <font size=2 face=Courier><strong><em>priority</em></strong></font> is either "<font size=2 face=Courier><strong>High</strong></font>" or "<font size=2 face=Courier><strong>Low</strong></font>" for high and low scheduling priority trap handlers, and <font size=2 face=Courier><strong><em>name</em></strong></font> is the trap group name.</font>
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<a name="1204467"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">On the ST20C1 the name is simply:</font>
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<a name="1204468"> </a><font size=2 face=Courier><strong>Trap[<font size=2 face=Courier><strong><em>name</em></strong></font>]<br></strong></font>
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<a name="1204469"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">where <font size=2 face=Courier><strong><em>name</em></strong></font> is the name of the exception handler.</font>
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