User manual

Chapter 5 Counters
E Series User Manual 5-8 ni.com
Figure 5-8 shows the timing requirements for the Ctr1Gate signal.
Figure 5-8. Ctr1Gate Signal Timing Requirements
Counter 1 Internal Output Signal
The Counter 1 Internal Output (Ctr1InternalOutput) signal is the output of
Counter 1. This signal reflects the terminal count (TC) of Counter 1. The
counter generates a terminal count when its count value rolls over. The
two software-selectable output options are pulse on TC and toggle output
polarity on TC. The output polarity is software-selectable for both options.
Figure 5-9 shows the behavior of the Ctr1InternalOutput signal.
Figure 5-9. Ctr1InternalOutput Signal Behavior
You can use Ctr1InternalOutput in the following applications:
• In pulse generation mode, the counter drives Ctr1InternalOutput with
the generated pulses. To enable this behavior, software configures the
counter to toggle Ctr1InternalOutput on TC.
• Ctr1InternalOutput can control the timing of analog output
acquisitions by driving ao/SampleClock.
• Counter 0 and 1 can be daisy-chained together by routing
Ctr1InternalOutput to Ctr0Gate.
Rising-Edge
Polarity
Falling-Edge
Polarity
t
w
t
w
= 10 ns minimum
Ctr0Source
Ctr0InternalOutput
(Pulse on TC)
Ctr0InternalOutput
(Toggle Output on TC)
TC