某移位型计数器中移位寄存器触发器级数为n，则组成的环形计数器和扭环形计数器的进位模数依次为（）。
- A.n，2n
- B.n，n
- C.2n，n
- D.2n，2n
正确答案及解析
正确答案
解析
本题考查时序逻辑电路中计数器的基础知识。移位型计数器是由触发器组成的计数器，一般包括环形计数器和扭环形计数器两种，环形计数器是由移位寄存器加上一定的反馈电路构成的，它是由一个移位寄存器和一个组合反馈逻辑电路闭环构成，反馈电路的输出接向移位寄存器的串行输入端，反馈电路的输入端根据移位寄存器计数器类型的不同，可接向移位寄存器的串行输出端或某些触发器的输出端。环形计数器的计数长度为N=n，和二进制计数器相比，它有2n-n个状态没有利用。扭环形计数器相对于环形计数器，提高了电路状态的利用率，n个触发器组成的扭环形计数器的模数是2n，有效状态比环形计数器状态多了1倍。
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