Chapter 7 Counters
© National Instruments 7-41 X Series User Manual
Counter Timing Signals
X Series devices feature the following counter timing signals:
• Counter n Source Signal
• Counter n Gate Signal
• Counter n Aux Signal
• Counter n A Signal
• Counter n B Signal
• Counter n Z Signal
• Counter n Up_Down Signal
• Counter n HW Arm Signal
• Counter n Sample Clock Signal
• Counter n Internal Output Signal
• Counter n TC Signal
• Frequency Output Signal
Note All counter timing signals can be filtered. Refer to the PFI Filters section of
Chapter 8, PFI, for more information.
In this section, n refers to the X Series Counter 0, 1, 2, or 3. For example,
Counter n Source refers to four signals—Counter 0 Source (the source
input to Counter 0), Counter 1 Source (the source input to Counter 1),
Counter 2 Source (the source input to Counter 2), or Counter 3 Source (the
source input to Counter 3).
Each of these signals supports digital filtering. Refer to the PFI Filters
section of Chapter 8, PFI, for more information.
Counter n Source Signal
The selected edge of the Counter n Source signal increments and
decrements the counter value depending on the application the counter is
performing. Table 7-8 lists how this terminal is used in various
applications.
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