W91F820N Datasheet, PDF (16/20 Pages) Winbond – 13-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

Preliminary W91F820N SERIES
Timing Waveforms, continued
HKS
HFI
H KEY
HFO
T/P MUTE
H/P MUTE
CHIP ENABLE
OFF HOOK
HIGH
Figure 3(b)
Note: The H KEY and HFI inputs will toggle the HFO signal. The first time HFI or H KEY are activated, the HFO signal will go
high and the previous active input will be neglected.
HKS
HFI
H KEY
HFO
T/P MUTE
H/P MUTE
CHIP ENABLE
ON HOOK
HIGH
Figure 3(c)
Note: The HKS signal change of state from high to low will initialize both the HFO and H/P MUTE signals.
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