單項(xiàng)選擇題MCS51單片機(jī)的定時(shí)/計(jì)數(shù)器0對(duì)應(yīng)的C/T’=1,當(dāng)前計(jì)數(shù)器的值為18,當(dāng)P3.4經(jīng)過4個(gè)周期,內(nèi)部晶體振蕩器經(jīng)過36個(gè)周期以后,計(jì)數(shù)器的值為()

A.21
B.1BH
C.1CH
D.22


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