你用哪个信号作为捕获信号？
终端计数中断， 中断中做什么？
当计数器==0的时候算溢出，
On the rising clock edge following the zero count, the Count register is reloaded from the Period register. On the next falling edge, the terminal count event is triggered and the output is asserted high for one-half clock cycle or a full clock.
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