Part Number: MSP430F5438A
当选用定时器B，来做脉冲计数的时候，选用P4.7作为时钟输入，P4.0的输入方波作为捕捉信号
请问：
TBSSEL=0时，选用了外部时钟输入， 计数的时候，是根据外部信号的上升沿计数，还是下降沿计数？
谢谢
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