ADLINK USB-1210 - Manual (Page 44)

34 Operation & Calibration
of GPTC_GATE. After the completion of the period interval on
GPTC_GATE, GPTC_OUT outputs high and then current count
value can be read by the software application. Operation in which
initial count = 0, count-up mode is shown.
Figure 3-15: Mode 2-Single Period Measurement
Mode 3: Single Pulse-Width Measurement
The counter calculates the pulse-width of the signal on
GPTC_GATE in terms of GPTC_CLK. Initial count can be loaded
from the software application. After software start, the counter cal-
culates the number of active edges on GPTC_CLK when
GPTC_GATE is in its active state.
After the completion of the pulse-width interval on GPTC_GATE,
GPTC_OUT outputs high and current count value can be read by
the software application. Operation in which initial count = 0,
count-up mode is shown.
0 0 1 2 3 4 5 5 5
Gate
CLK
Count value
Software start
0 0 1 2 3 4 5 5 5
Gate
CLK
Count value
Software start