wince或者单片机等开发usb外接设备时,可以考虑用已经集成的库来开发,以缩短开发周期.-Singlechip wince or usb external device, such as the development can be considered to have an integrated database development, so as to shorten the development cycle.

用keil开发的-单片机税控器程序(单片机用的是AT公司的.upsd3245) 全部，包含：LCD SIM USB通信的。欢迎下载-Keil development- Microcontroller tax control program (MCU AT company. Upsd3245) contains: LCD SIM USB communication. Welcome to download