Advantech MIC-3756, Manual

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is Logic“1”, write logic“0” into the Bit1 of Count Reset Register,
Users can clear the toggle output.
Counter Mode with High Level Active Gate Control
In this mode, the gate input affects counter operation. Once started,
the counter will count to TC repetitively. The counter will count all
source edges that occurred while the gate high level is active and
disregard those edges that occurred while the gate is inactive.
On each TC the counter will reload the initial value of counter from
the counter set value register (Base Add.+ 18h). The counter output
mode may be obtained with the TC output mode or the TC toggled
output mode by specifying in the counter mode register (CM5, CM4);