Counter/Timer Features; Units; C/T Clock Sources - Measurement Computing Data Translation DT3010 Series User Manual

Counter/Timer Features

The counter/timer circuitry on the board provides the clocking circuitry used by the A/D and
D/A subsystems as well as several user counter/timer features. This section describes the
following user counter/timer features:

• Units

• C/T clock sources

• Gate types
• Pulse types and duty cycles
• Counter/timer operation modes
Units
DT3010 Series boards support four user 16-bit counter/timer units (called counters); counters
are numbered 0, 1, 2, and 3.
Each counter accepts a clock input signal and gate input signal and outputs a clock output
signal (also called a pulse output signal), as shown in
Clock Input SIgnal
(internal, external, or
internally cascaded)
Each counter corresponds to a counter/timer (C/T) subsystem. To specify the counter to use
in software, specify the appropriate C/T subsystem. For example, counter 0 corresponds to
C/T subsystem element 0; counter 3 corresponds to C/T subsystem element 3.
C/T Clock Sources
The following clock sources are available for the user counters:
• Internal C/T clock
• External C/T clock
• Internally cascaded clock
Refer to the following subsections for more information on these clock sources.
Counter
Gate Input Signal
(software or external
input)
Figure 63: Counter/Timer Channel
Figure 63.
Pulse Output Signal
Principles of Operation
131