it is a bootloader of c8051f340. open it with keil. after download its HEX file into target board. connet target s UART0 with PC s COM , config COM port as 115200-8-n-1, use Xmode to transmit file. then power on target.

C8051F340的USB HID方式的BOOTLOADER，包含使用说明，固件代码（Keil uv3工程），上位机可执行文件.-C8051F340 USB HID mode BOOTLOADER, contains instructions for use, the firmware code (Keil uv3 engineering), host computer executable file.

Nordic Semiconductor 的2.4G无线解决方案代码，有nRF24LU1的BOOTLOADER Source code,使用KEIL环境开发，以及C#开发的USB上位机UI界面，非常值得参考，特别是搞USB及2.4G无线通讯的-Nordic Semiconductor' s 2.4G wireless solution code, there is nRF24LU1 of BOOTLOADER Source code, use the KEIL environment, deve

Nordic的SoC 8051晶片-nRF24LE1,Bootloader for UART 程式碼,用keil C編譯-The Nordic SoC 8051 chip-The nRF24LE1, the Bootloader for the UART program code using keil C compiler