USB to serial procedures, has been through the debugging, debugging environment keilc.

USB2UART
........\EDN_USB_Board_USB2UART_Driver.inf
........\SourceCode
........\..........\AT89X52.H
........\..........\config.h
........\..........\Key.c
........\..........\Key.h
........\..........\Key.LST
........\..........\Key.OBJ
........\..........\LED.h
........\..........\My_type.h
........\..........\PDIUSBD12.h
........\..........\UART.c
........\..........\UART.h
........\..........\UART.LST
........\..........\UART.OBJ
........\..........\USB.H
........\..........\USB2UART
........\..........\USB2UART.c
........\..........\USB2UART.H
........\..........\USB2UART.hex
........\..........\USB2UART.lnp
........\..........\USB2UART.LST
........\..........\USB2UART.M51
........\..........\USB2UART.OBJ
........\..........\USB2UART.Opt
........\..........\USB2UART.plg
........\..........\USB2UART.Uv2
........\..........\USB2UART_Opt.Bak
........\..........\USB2UART_Uv2.Bak
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