在用户手册的562页，有如下一段讲解了外部输入时钟同步的概念“：
The external clock input passes through a synchronizer clocked by the TPM counter
clock to assure that counter transitions are properly aligned to counter clock transitions.
Therefore, to meet Nyquist criteria considering also jitter, the frequency of the external
clock source must be less than half of the counter clock frequency.
这个同步是和TPM的计数时钟同步。
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