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C6748时钟问题

Other Parts Discussed in Thread: TMS320C6748

查看C6748寄存器,PLL0->PLLCTL->CLKMODE=1,根据C6748技术参考手册:“参考时钟来自方波,而不是内部振荡器”,请问这个方波时从哪儿来的,频率为多少。