In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

The capture mode is meant to capture the time duration of a single event hence the need to , whereas the external event is meant to capture the counts of multiple events. An alternative to the method I described above is using both 16 bit timers, the first is set to external event mode, setting up the the span of r1 and r2 to be 1000 cycles. The output of the external even timer is used as the input to the second timer which is configured in the capture/compare mode, in which you retrieve the capture register. I may not have to precise methodology correct, but the combination of the two timers configured as such should accomplish what you are after.

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