楼主你好！
不好意思，迟回复你了。
是可以修改BUSCLK的，但是需要满足如下要求：
The bus clock and flash clock frequency is divided from the system clock and is
programmable from a divide-by-1 through divide-by-8 setting. The bus clock and
flash clock must be programmed to 24 MHz or slower.
楼主
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