I/0中断顺序执行，所以单个l/0中断的反应时间受前面的中断块执行时间影响。(最坏的情况是系统中所有的Vo中断同时发生，则最后–个执行的中断必须等待其他中断执行完成才能执行)激活一个空的程序块的l/O中断的扫描影响测量的是守备中断时间，启动模块时间，退出模块时间和重启中断任务的时间总和。最小，典型和最大的中断响应时间反映了从单个l/0模块接收到输入脉冲到中断块中第一行逻辑执行时刻的时间间隔

 

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