MCU：51内核各系列单片机 DTMF双音频信号解码芯片：MT8870 显示：带中文字库的128*64点阵形液晶模块 （注：MCU使用12M晶振，以本C51程序的算法，编译后，程序约占用2K字节， 电话本每组约占用20~40字节，每组信息包括电话号码，姓名，单位）

mt8870.c

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