Counter N Source Signal; Routing A Signal To Counter N Source; Routing Counter N Source To An Output Terminal - National Instruments Data Acquisition Device NI USB-621x User Manual

Chapter 8 Counters

Counter n Source Signal

NI USB-621x User Manual
The selected edge of the Counter n Source signal increments and
decrements the counter value depending on the application the counter
is performing. Table 8-3 lists how this terminal is used in various
applications.
Table 8-3. Counter Applications and Counter n Source
Application
Pulse Generation
One Counter Time Measurements
Two Counter Time Measurements
Non-Buffered Edge Counting
Buffered Edge Counting
Two-Edge Separation

Routing a Signal to Counter n Source

Each counter has independent input selectors for the Counter n Source
signal. Any of the following signals can be routed to the Counter n Source
input:
• 80 MHz Timebase
• 20 MHz Timebase
• 100 kHz Timebase
• (USB-6210/6211/6215 Devices)
• (USB-6212/6216 Devices)
•
(USB-6218 Devices)
In addition, Counter 1 TC or Counter 1 Gate can be routed to
Counter 0 Source. Counter 0 TC or Counter 0 Gate can be routed to
Counter 1 Source.
Some of these options may not be available in some driver software.

Routing Counter n Source to an Output Terminal

You can route Counter n Source out to any output PFI terminal.
Purpose of Source Terminal
Counter Timebase
Counter Timebase
Input Terminal
Input Terminal
Input Terminal
Counter Timebase
PFI <0..3>
PFI <0..15>
PFI <0..3>, PFI <8..11>
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