Chapter 7
Counters
7-22
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You also can use the Gate input of the counter as a Pause Trigger (if it is not
used as a Start Trigger). The counter pauses pulse generation when the
Pause Trigger is active.
Figure 7-25 shows a continuous pulse train generation (using the rising
edge of Source).
Figure 7-25.
Continuous Pulse Train Generation
Continuous pulse train generation is sometimes called frequency division.
If the high and low pulse widths of the output signal are
M
and
N
periods,
then the frequency of the Counter
n
Internal Output signal is equal to the
frequency of the Source input divided by
M
+
N
.
For information about connecting counter signals, refer to the
section.
Finite Pulse Train Generation
This function generates a train of pulses of predetermined duration. This
counter operation requires both counters. The first counter (for this
example, Counter 0) generates a pulse of desired width. The second
counter, Counter 1, generates the pulse train, which is gated by the pulse of
the first counter. The routing is done internally. Figure 7-26 shows an
example finite pulse train timing diagram.
Figure 7-26.
Finite Pulse Train Timing Diagram
S
OURCE
OUT
Co
u
nter Armed
Co
u
nter 0
(P
a
ired Co
u
nter)
Co
u
nter 1
Gener
a
tion
Complete
