Chapter 7
Counters
7-20
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Figure 7-22 shows a generation of a pulse with a pulse delay of four and a
pulse width of three (using the rising edge of Source).
Figure 7-22.
Single Pulse Generation
Single Pulse Generation with Start Trigger
The counter can output a single pulse in response to one pulse on a
hardware Start Trigger signal. The pulse appears on the Counter
n
Internal
Output signal of the counter.
You can route the Start Trigger signal to the Gate input of the counter. You
can specify a delay from the Start Trigger to the beginning of the pulse. You
also can specify the pulse width. The delay and pulse width are measured
in terms of a number of active edges of the Source input.
After the Start Trigger signal pulses once, the counter ignores the Gate
input.
Figure 7-23 shows a generation of a pulse with a pulse delay of four and a
pulse width of three (using the rising edge of Source).
Figure 7-23.
Single Pulse Generation with Start Trigger
Retriggerable Single Pulse Generation
The counter can output a single pulse in response to each pulse on a
hardware Start Trigger signal. The pulses appear on the Counter
n
Internal
Output signal of the counter.
S
OURCE
OUT
Co
u
nter Armed
S
OURCE
GATE
(
S
t
a
rt Trigger)
OUT
