Here's a 2nd graphic showing how PULSIN records the 2nd high-going pulse. Note how P1B
doesn't return low until after the 2nd high pulse.
PULSIN didn't record the 1st because it started after the leading edge. It does grab the 2nd
since it happens before the time-out period. The delay between high pulses was shortened
to the time period shown at B-->C:
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