The manual says: ETCP: External timestamp prescaler value. The HCLK is divided down by the prescaler
value plus 1 to clock the external timestamp counter.
What is HCLK?
Hi @wangyanjun
Thank you so much for using our community. I really appreciate your patience.
Regarding your question, HCLK is the main clock of your board, so this one is divided by the prescaler value plus 1 to determinate the clock for the external timestamps counter.
Hope this helps, please let me know if you have more questions.
Best Regards.
Pablo Avalos.