USB2.0开发例程，基于51单片机，包括pc端程序-USB2.0 development routines, based on 51 MCU, including the pc-procedures

基于51单片机实现PC键盘功能的程序和原理图-PC keyboard functions based on 51 single-chip implementation procedures and schematics

USB2.0开发例程，基于51单片机，包括pc端程序。 -USB2.0 to develop routines, based on 51 single-chip, including the pc client procedures.

51单片机通过CH372（内置固件模式程序）传输数据给PC机(USB is the English acronym for Universal Serial BUS, Chinese meaning is "Universal Serial Bus." It is not a new bus standard, but in the PC field of application interface technology.)