34
Operation & Calibration
cation. 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 3-16: Mode 3-Single Pulse-Width Measurement
Mode 4: Single-Gated Pulse Generation
This mode generates a single pulse with programmable delay and pro
-
grammable pulse-width following software start. The two programma
-
ble parameters can be specified in terms of periods of the GPTC_CLK
input by the software application. GPTC_GATE enables/disables calcula
-
tion. When GPTC_GATE is inactive, the counter halts the current count
value. Generation of a single pulse with a pulse delay of two and a
pulse-width of four is shown.
Figure 3-17: Mode 4-Single-Gated Pulse
0
0
1
2
3
4
5
5
5
Gate
CLK
Count value
Software start
2
2
1
0
3
2
2
1
0
Gate
CLK
Count value
OUT
Software start
Содержание USB-61210
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