外部中断是单片机实时地处理外部事件的一种内部机制。当某种外部事件发生时，单片机的中断系统将迫使CPU暂停正在执行的程序，转而去进行中断事件的处理；中断处理完毕后．又返回被中断的程序处，继续执行下去。
AIX V7.1允许对部署工作负载的cpu集禁用外部中断。
AIX V7.1 includes the ability to disable external interrupts on a specific set of CPUs where a workload is deployed.
详细讨论了在打印过程中遇到外部中断时的程序处理方法。
It has detailed discuss for the program process methods when meeting with external interrupt during the printing procedure.
在需要有多个外部中断的应用场合，需要给单片机扩展外部中断源。
In the application situation that needs to have many external interrupts, it is needed to expand the SCM's exterior interrupts.
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