Chapter 9

Counters

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 9-4lists how this terminal is used in various applications.

Table 9-4.Counter Applications and Counter n Source

Application

Purpose of Source Terminal

 

 

 

 

Pulse Generation

Counter Timebase

 

 

One Counter Time Measurements

Counter Timebase

 

 

Two Counter Time Measurements

Input Terminal

 

 

Non-Buffered Edge Counting

Input Terminal

 

 

Buffered Edge Counting

Input Terminal

 

 

Two-Edge Separation

Counter Timebase

 

 

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

•PFI <0..3>, PFI <8..11>

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 PFI <4..7> or PFII <12..15> terminal.