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CPU is a sequentially executing machine. It will execute theinstructions from it's instruction set one-by-one untileither program execution sequence is modified or the CPU isinstructed to stop execution.However, if any peripheral device wishes the CPU to knowthat it needs it's attention, then they inform throughinterrupts. IRQ stands for Interrupt Request and FIQ standsfor Fast Interrupt Request.IRQ is serviced at a normal priority level and FIQ isserviced at high priority level.

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