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我想只用硬件配置，不进行编程，应该怎样实现呢？手册看不明白啊，大神给帮帮忙
不进行编程的话，输入25MHz，输出25Mhz可以实现，因为默认配置就是输入直接输出（PLL bypass，Pdiv=1）。
但是如果输入25MHz，输出50Mhz，就需要通过I2C进行编程，对内部寄存器进行配置得到。
