处理器包含一个时钟，一条指令控制单元，一个算术和逻辑单元，并登记。
The processor contains a clock, an instruction control unit, an arithmetic and logic unit, and registers.
换句话说，控制单元在解决完中断信号后，处理的指令就是选中的处理函数的第一条指令。
In other words, the instruction processed by the control unit after dealing with the interrupt signal is the first instruction of the selected handler.
在执行这个指令之前，控制单元检查在它执行前一条指令时，是否有中断或异常产生。
Before dealing with that instruction, the control unit checks whether an interrupt or an exception occurred while the control unit executed the previous instruction.
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