A N+ 1 months IO I realize the N × N matrix A keyboard Abstract Introduction N+ 1 months I/O ports realize N × N matrix of the general approach the keyboard and used the method to design a 5 × 5 s Matrix keyboard as an example, given the preparation of block diagram software and to explore the method. Key words keyboard matrix interface circuit

Packet : 31767653io_nn_kb.zip filelist
一种用N+1个IO口实现的N×N矩阵式键盘.doc

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