The Realization of the Embedded USB Host System based on SCM

It implements USB host system function in application system of the Single Chip Microcomputer without operating system, and establishes FAT file system on USB flash disk, implements the read and write file in USB flash disk and makes USB flash disk be the storage of the application of SCM, which greatly facilitates the application of SCM in the data acquisition, memory, processing, and transmission aspect. And on this basis, procedure can be slightly modified to implement brief exchange of data between USB flash disk without computer.