W91520N Datasheet, PDF (13/16 Pages) Winbond – TONE/PULSE DIALER WITH HANDFREE AND HOLD FUNCTION

Timing Waveforms, continued
HKS
12 H
H
KEY IN
MODE
DP
DTMF
T/P MUTE
H/P MUTE
HFI
HFO
OSC
W91520N SERIES
H
HH
Figure 3. Handfree Function Timing Diagram
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Publication Release Date: May 1997
Revision A3