This thesis takes Lingyang chip microcomputer and USB chipset PDIUSBD12 as the core of controlling device, and makes a systemic study of USB related techniques and USB interface drive program.

本论文以凌阳单片机和PDIUSBD 12构成USB设备控制端，对usb相关技术和USB设备驱动程序的编写进行研究。

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Making use of microcomputer techniques, the interface collects information from common control exchange HJ-921 and repeats called subscriber number to rural telephone exchange.

该接口利用微型计算机技术从HJ—921型交换机的公共控制设备采集，并向农村支局自动交换机转发被叫用户号码。

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As a fundamental major course of relative majors of electrical and information in higher vocational colleges, the course Microcomputer Principles and Interface Techniques is of great practice.

《微机原理与接口技术》是高职院校电气信息类专业的一门专业基础课程，其课程实践性很强。

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