問(wèn)答題模為16的計(jì)數(shù)器,控制信號(hào)為MA和MB。MA和MB為00時(shí)不計(jì)數(shù),01時(shí)加法計(jì)數(shù)器,10時(shí)減法計(jì)數(shù)器,11時(shí)預(yù)置數(shù)功能。(計(jì)數(shù)結(jié)果由數(shù)碼管顯示)

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