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芯片：74HC191,74HC138,74HC04仿真图：方式一：方式二：
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74LS191英文手册，感兴趣的小伙伴们可以瞧一瞧。
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可预置同步 4 位二进制向上/向下计数器-74HC191
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74HC942英文手册
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