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SIM读卡器和手机数据接口是基于PC机串行通信口,利用一片74HC14芯片实现接口功能。文中分别分析SIM卡、74HC14和PC机串行通信口相关的特性;并介绍电路原理和接口制作的方法。
SIM card reader and mobile phone data interface is based on PC serial communication port, the use of a 74HC14 chip interface functions. This paper analyzes the SIM card, 74HC14 and PC serial communication port related features; and introduces the circuit principle and interface production methods.