说明：  对USB总线的基本特性，特别是对USB2.0标准进行比较详细的介绍，并对新型8位和16位USB单片机的结构和性能特点进行了介绍。
(pair of USB's basic characteristics, in particular the USB2.0 standard more detailed briefing, Meanwhile, a new type of eight and 16 USB MCU structure and performance characteristics was introduced.)