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<a name="1204403"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">9 Interrupts</font>
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<a name="1204404"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Interrupts are a mechanism by which part of a system external to the CPU signals to the CPU to perform some action on its behalf. This can be an external device connected to the processor chip via an interrupt pin or an internal on-chip peripheral with a direct wire into the interrupt controller. Typically this would be used to signal that some device has some data ready to be processed by the CPU or has completed a previous task and is now ready again.</font>
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<a name="1204405"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">There can be a number of different interrupts which can be used by different devices. These interrupts can be prioritized so that more urgent activities interrupt lower levels of interruption (this is called pre-emptive interruption). In this way, a system can always guarantee a maximum latency between an interrupt condition happening and it being handled (assuming no higher levels of interruption become active in the mean time). </font>
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