wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 71
wm9714l
Manufacturer Part Number
wm9714l
Description
Ac?97 Audio Codec
Manufacturer
Wolfson Microelectronics plc
Datasheet
1.WM9714L.pdf
(119 pages)
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COMP2 DELAY FUNCTION
COMP2 has an optional delay function for use when the input signal is noisy. When COMP2 triggers
and the delay is enabled (i.e. COMP2DEL is non-zero), then GPIO bit 14 does not change state
immediately, and no interrupt is generated. Instead, the WM9714L starts a delay timer and checks
COMP2 again after the delay time has passed. If COMP2 is still active, then the GPIO bit is set and
an interrupt may be generated (depending on the state of the GW14 bit). If COMP2 is no longer
active, the GPIO bit is not set, i.e. all register bits are as if COMP2 had never triggered.
Figure 26 COMP2 Delay Flow Chart
000
time=COMP2DEL
START TIMER
SHUT DOWN
TRIGGERS
SET GI14
COMP2?
non-zero
COMP2
COMP2
TIMER
C2W?
Active
WAIT
DEL?
END
1
Inactive
0
[FALSE ALARM]
END
END
PP, Rev 3.2, October 2008
WM9714L
71
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