用C编程实现AVR单片机的设置时钟功能。AVR单片机功能强大，可以实现很多功能，此功能是设置时钟功能，对初学AVR有很大的帮助。-C programming the AVR microcontroller to set the clock function.Powerful AVR microcontroller, and can achieve a lot of features, this feature is to set the clock function, a great help for beginners AVR.