JYTEK NuDAQ PCI-69222, User Manual

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Operation Theory 55
Mode 9: Edge Separation Measurement
Measures the time differentiation between two different pulse
signals. The first pulse signal is connected to GPTC_GATE
and the second signal is connected to GPTC_AUX. It counts
the clocks that pass by between the rising edge signal of two
different pulses through the 40MHz internal clock or external
clock. You can calculate the time period via the known clock
frequency. The maximum counting width is 32-bit. Figure 4-26
illustrates how the counter value decreases in Edge Separation
Measurement mode.
Figure 4-26: Mode 9 Operation
Mode 10: PWM Output
These cards’ powerful timer/counter can also simulate a PWM
(Pulse Width Modulation) output. By setting varying number of
Pulse_initial_cnt and Pulse_length_cnt, you can get varying
pulse frequency (Fpwm) and duty cycle (Dutypwm). Figure 4-27
illustrates the PWM output and the formula showing how to
calculate the PWM frequency and duty cycle.
Figure 4-27: Mode 10 Operation