Functions of the board
APCI-3xxx
42
Downwards counter
Fig. 8-8: Run down of the downwards counter
In order to get the same counting value as in the upwards mode, the reload
value must be set on 3. The counter counts down to 0 and will be reset to the
reload value from the next edge cycle on.
8.7
Setting a TTL output
At the run down of the counter/timer/watchdog a TTL output can be set.
Here also the output level can be defined. The output will be enabled for an
(input) clock.
Fig. 8-9: Example: Setting a TTL output
Allocation to counters/timers:
Counter/Timer 0
=
TTL0
Counter/Timer 1
=
TTL1
Counter/Timer 2
=
TTL2
