说明：  用GCC来写的一些avr mega16单片机常用源程序，对于一些新手会很有用，并且很实用，里面有关于dianzhen的，lcd，外部中断，pwm波等源代码。
(GCC used to write some of the commonly used microcontroller avr mega16 source, would be useful for some beginners, and very practical, there are about dianzhen' s, lcd, external interrupt, pwm wave such as source code.)