USB接口类型的描述以及定义，图文版，包含各种以前的和现行的USB接口的图片和口线顺序-USB interface type descr iptions and definitions, facsimile edition, contains a variety of previous and current images and the USB interface port line order

本文介绍了一种基于USB总线的数据采集系统的设计方法，采用PHILIPS公司的USB接口芯片PDIUSBD12与单片机AT89C51进行通信，并和PC机通信而编制出友善的设备应用程序。-this article presents a particular descr iption of the design and development of a data collection system based on USB.single chip programs the fireware to t