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what is difference between IRQ and FRQ

作者: stevenliyong 相关  |  发布日期 : 2015-02-11  |  热度 : 393°

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CPU is a sequentially executing machine. It will execute the
instructions from it's instruction set one-by-one until
either program execution sequence is modified or the CPU is
instructed to stop execution.

However, if any peripheral device wishes the CPU to know
that it needs it's attention, then they inform through
interrupts. IRQ stands for Interrupt Request and FIQ stands
for Fast Interrupt Request.

IRQ is serviced at a normal priority level and FIQ is
serviced at high priority level.