当一个中断发生，当前的处理器状态被保存并且中断服务程序开始运行。
When an interrupt occurs, the current state of the processor is saved and an interrupt service routine is executed.
当一个中断发生，当前的处理器状态被保存并且中断服务程序开始运行。
When an interrupt occurs the current state of the processor is saved and an interrupt service routine is executed.
当外设发出这个信号，我们说一个中断发生。
When the peripheral asserts this signal, we say that an interrupt occurs.
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