Description
移位寄存器对移位脉冲输入端开关的抖动非常敏感。若开关抖动一次,相当于多输入了一个移位脉冲,移位数据“1”随之多移了一位。由于接点式开关被触发时难免产生抖动。为消除这种影响,在移位脉冲输入端的步1输入回路,必须串联移位寄存器0位(本例为M20)的常闭触点,
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