what is difference between IRQ and FRQ

最新推荐文章于 2024-07-15 22:14:51 发布

转载最新推荐文章于 2024-07-15 22:14:51 发布 · 1.9k 阅读

本文介绍了CPU的基本工作原理，即按指令集顺序执行指令。同时，详细解释了外围设备如何通过IRQ(普通中断请求)和FIQ(快速中断请求)两种方式来请求CPU的注意，其中IRQ为普通优先级，而FIQ则具有更高优先级。

http://www.allinterview.com/showanswers/96317.html

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.