在简单介绍USB原理的基础上,给出了嵌入式USBhost功能模块软、硬件设计的思路和方法,用以实现单片机和USB设备间的数据传输。一、前言由于各种各样的基于USB的移动设备都集成有USB设备功能,导致具有USB接口的数字设备无法应用到嵌入式系统中。因此,USB主机的嵌入式应用就成了USB领域新的研究的焦点。解决这一问题可在USB设备的嵌入式系统中集成USB Host功能模块,使之具有与USB设备进行数据 Based on the brief introduction of USB principle, the idea and method of software and hardware design for embedded USBhost function module are given, which can realize data transmission between MCU and USB device. I. INTRODUCTION Since a variety of USB-based mobile devices are integrated with USB device functions, digital devices with a USB interface can not be applied to the embedded system. Therefore, the embedded application of the USB host becomes the new research focus in the USB field. To solve this problem, USB Host functional modules can be integrated into the embedded system of the USB device to make data with USB devices