数字电路中的MSI器件构成任意进制的计数器通常有三种方法:(1)级联法;(2)复位法;(3)置位法。其中置位法是利用计数器的预置数功能,使N进制计数器在循环计数过程中跳跃(N—M)个状态来实现M进制计数的。此外,置位法还牵涉到过渡状态与不过渡状态的利用问题。因此,学生在应用这种方法时往往会产生许多困惑,为了帮助学生收到事半功倍之效,本文就置位法中有无过渡状态的应用问题,举出相关实例,使学生能更 MSI devices in digital circuits form an arbitrary number of counters typically in three ways: (1) cascaded; (2) reset; and (3) set. One set method is to use the counter preset number of functions, so that the N-ary counter in the cycle count jump (N-M) state to achieve the M-ary count. In addition, the set method also involves the use of transitional and non-transitional issues. Therefore, students often have a lot of puzzles in applying this method. In order to help students receive more with less, this paper discusses the application of the transitional method in setting methods and gives examples to help students