W91F820N Datasheet, PDF (15/20 Pages) Winbond – 13-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

Preliminary W91F820N SERIES
Timing Waveforms, continued
HKS
KEY IN
DTMF
T/P MUTE
H/P MUTE
KT
DP
OSC.
ON HOOK
R/P
TKID
T_TD
T
T > TOHD
TITP
LOW
(return to initial state)
OSC.
HIGH
Figure 2(e) Tone Mode Timing Diagram with On-hook Debounce (Auto dialing without lock)
HKS
HFI
OFF HOOK
ON HOOK
H KEY
HFO
T/P MUTE
H/P MUTE
HIGH
LOW
CHIP ENABLE
Note: The H KEY can not be enabled during chip dissable.
Figure 3(a)
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Publication Release Date: January 1999
Revision A1