SIM reads the card and the handset data interface is based on the PC machine serial port, USES a piece of 74hc14 chip to realize the interface function.
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。
IBM PC and single chip microcomputer communication hardware circuit, software interface and measure to improve reliability of communication.
IBM PC机与单片机通讯的硬件电路、软件接口以及提高通讯可靠性的措施。
The paper introduces an approach of serial communication of PIC16F877 single chip computers with PC and provides a hardware interface circuit and a communication source program.
介绍了PIC16F877单片机与PC机实现串行通信的一种方法，并给出了硬件接口电路及通信源程序。
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