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文章介绍一种用Ｉ２Ｃ总线接口通用器件ＰＣＦ８５７４扩展的行列式键盘，是单片机应用系统扩展键盘接口时可选择的一种简明而有效的方案。
This article introduces a determinant type keyboard extended with PCF8574 common device of I2C bus interface, it is a concise and effective scheme that the one-chip computer application system expands keyboard interface to choose from.