通过实验，熟悉如何设置系统主时钟(MCLK)、辅助时钟(ACLK)、

子系统时钟(SMCLK)

程序运行后可以得到ACLK＝32768、MCLK＝SMCLK＝32768*10

-Through the experiment, be familiar with how to set up the system master clock (MCLK), auxiliary clock (ACLK),

Subsystem (SMCLK clock)

After the program is running can be ACLK = 32768, MCLK = SMCLK = 32768* 10