User`s guide

I/O Driver Blocks
4-21
5 From Clock input active edge, which determines which clock edge should
increment the counter, select
-
rising — Low to high transitions
-
falling — High to low transitions
Not all counter chips support selecting the input edge. In this case, the
pull-down menu will reflect the supported option only.
6 From Gate input functionality, which defines the action of the counter’s
gate pin, select
-
none — Gate is disabled.
-
enable when high — Counting is disabled when the gate is low and
enabled when the gate is high.
-
enable when low — Counting is disabled when the gate is high and
enabled when the gate is low.
-
start on rising edge — Counting is disabled until low to high transition
of the gate occurs.
-
start on falling edge — Counting is disabled until high to low
transition of the gate occurs.
-
reset on rising edge — Counter is reset when low to high transition of
the gate occurs.
-
reset on falling edge — Counter is reset when high to low transition of
the gate occurs.
-
latch on rising edge — The count of the counter is remembered when
low to high transition of the gate occurs.
-
latch on falling edge — The count of the counter is remembered when
high to low transition of the gate occurs.
-
latch & reset on rising edge — The count of the counter is remembered
and then the counter is reset when low to high transition of the gate
occurs.