描述
输入处理也叫输入采样。在此阶段，顺序读入所有输入端子的通端状态，并将读入的信息存入内存中所对应的映象寄存器。在此输入映象寄存器被刷新。接着进入程序执行阶段。在程序执行时，输入映象寄存器与外界隔离，即使输入信号发生变化，其映象寄存器的内容也不会发生变化，只有在下一个扫描周期的输入处理阶段才能被读入信息。
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