本文介绍了一种基于TTL 串口的嵌入式USB 主机系统。介绍了该系统的硬件实现,以及USB 主机的底层驱动软件的实现,并简要介绍其在数据采集系统领域中的应用。 关键字:嵌入式;USB 主机;TTL 串口;Mass storage 类 Abstract:An Embedded USB Host System based on TTL Serial is introduced. The hardware of the system is described and the design of USB host driver is also provided. KeyWords:Embedded system ;USB host; TTL serial ; Mass storage class