© National Instruments Corporation 8-1 NI USB-621x User Manual
8
Counters
USB-621x devices have two general-purpose 32-bit counter/timers and
one frequency generator, as shown in Figure 8-1. The general-purpose
counter/timers can be used for many measurement and pulse generation
applications.
Figure 8-1. USB-621x Counters
Counter 0
Counter 0 Source (Counter 0 Timebase)
Counter 0 Aux
Counter 0 HW Arm
Counter 0 A
Counter 0 B (Counter 0 Up_Down)
Counter 0 Z
Counter 0 Gate
Counter 0 Internal Output
Counter 0 TC
Input Selection Muxes
Frequency Generator
Frequency Output Timebase Freq Out
Input Selection Muxes
Counter 1
Counter 1 Source (Counter 1 Timebase)
Counter 1 Aux
Counter 1 HW Arm
Counter 1 A
Counter 1 B (Counter 1 Up_Down)
Counter 1 Z
Counter 1 Gate
Counter 0 Internal Output
Counter 0 TC
Input Selection Muxes
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