【摘要】 针对传统的单片机系统数据存储和传输的不便之处,以考勤机为例,设计了一种在原来的考勤机系统中增加一片USB总线接口芯片CH375进行USB通信的方案,实现了考勤机与U盘/PC机之间的数据通信,既方便管理部门利用U盘来完成考勤数据的便捷存取,特别适用于数据量大,采集周期长的环境,又能实现考勤机系统通过USB数据线完成与PC机交换数据的功能。介绍了考勤机系统和CH375的硬件接口电路及其工作原理,给出了CH375作为主机以及从设备时的工作原理、主从模式切换以及软件流程。更多还原

【Abstract】 In the light of disadvantage that traditional MCU system in data storage and exchange,this paper takes the work-checking system for example,present a new design scheme that using the CH375 chip to realize the data communication between work-checking system and U-disk or PC.It is convenient for management to store the data by U-disk,especially accommodates the circumstances of huge data and long-working cycle,and also the connection of MCU and computer can be realized.This paper describes interface of the MCU and CH375,operating principles for host/slave mode switching as well as relative software.更多还原