National Instruments M Series User Manual

Chapter 7 Counters
M Series User Manual 7-22 ni.com
input. You also can specify the active edge of the Source input (rising or
falling).
The counter can begin the pulse train generation as soon as the counter is
armed, or in response to a hardware Start Trigger. You can route the Start
Trigger to the Gate input of the counter.
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 7-24 shows a continuous pulse train generation (using the rising
edge of Source).
Figure 7-24. 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 Default
Counter/Timer Pinouts section.
Frequency Generation
You can generate a frequency by using a counter in pulse train generation
mode or by using the frequency generator circuit.
Using the Frequency Generator
The frequency generator can output a square wave at many different
frequencies. The frequency generator is independent of the two
general-purpose 32-bit counter/timer modules on M Series devices.
SOURCE
OUT
Counter Armed

National Instruments M Series Specifications

General

Brand	National Instruments
Model	M Series
Category	Media Converter
Language	English