说明：  这是一个AVR单片机的头文件，有关引脚的位选，可BOOL输出输入，非常好用。我一直在用着。主要针对芯片ATMEGA128的头文件，其它的芯片也可向下兼容。
(This is an AVR MCU header files, the pin-bit elections BOOL input-output, very easy to use. I have been using. ATmega128 chip aimed at the header files, other chips can also be backward compatible.)