【单选题】
下列逻辑电路中为时序逻辑电路的是___ 。
A. 变量译码器
B. 加法器
C. 数码寄存器
D. 数据选择器
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答案
C
解析
暂无解析
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某电视机水平-垂直扫描发生器需要一个分频器将31500HZ的脉冲转换为60HZ的脉冲，欲构成此分频器至少需要___个触发器。
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24在8×51的程序里，若要将某个输入/输出端口设置成输入功能，应如何处理？___
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B. 先输出低电平到该输入/输出端口
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D. 先保存该输入/输出端口的状态
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29在Keil µVision3里进行调试/仿真时，在哪里操作才能触动程序中断？___
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【单选题】
36在12MHz的8×51系统里，哪一种方式一次可定时5ms？___
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