avr单片机usb下载器的制作资料，源码，及电路图。

delphi使用串口通信的控件PC向单片机发送6个字节的数据，单片机收到后返回PC显示。注释我都写很清楚了，你自己稍微改下就可以了。-delphi controls PC using serial communication sent to the MCU 6 bytes of data received and returned to PC display microcontroller. Note I have written very clearly, and you can slight