freescale单片机效率提高程序源代码，直接将此代码添加到初始化程序里面即可，原理是通过压缩空间、优化初始化来进行超频，从而提高效率。-freescale SCM efficiency program source code, directly to this code which can be added to the initialization process, the principle through the compression of space, optimizing the