Hi, I'm using a PIC18f252 with an ultrasonic transducer to receive
signal of 40kHz.  The thing is that I want to calculate the time from
the moment the first data arrive until the second data arrive.  How
can I do that?  Basically, I need to know the time difference between
the arrival of those two data?

I've looked and research on the timer but it's usually used as timer
for the number of pulses or something.  I'm having a hard time to
understand it.

Thanks in advance.
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