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介绍一种用N+1个I/O端口实现N×N矩阵式键盘的一般方法,并用该方法设计一个5×5的矩阵式键盘作为例子,给出软件编制框图并对该方法进行探讨。
This paper introduces a general method of implementing N × N matrix keyboard with N + 1 I / O ports, and uses this method to design a 5 × 5 matrix keyboard as an example, and gives a block diagram of software programming and discusses the method.