ADLINK Technology USB-2401, Руководство пользователя

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40 Operation
software application. Operation in which initial count = 0,
count-up mode is shown.
Figure 3-12: 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 calculates 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.
Figure 3-13: Mode 3-Single Pulse-Width Measurement
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