W91330N SERIES
Pin Description, continued
SYMBOL
18-PIN
20-PIN
I/O
FUNCTION
5
5
I
The function of this terminal is to prevent "0" dialing
and "9" dialing under PABX system long distance
call control. When the first key input after reset is 0
or 9, all key inputs, including the 0 or 9 key, become
invalid and the chip generates no output. The
telephone is reinitialized by a reset.
LOCK
(W91330LN
only)
(W91330ALN
only)
FUNCTION
Normal dialing mode
"0," "9" dialing inhibited
"0" dialing inhibited
LOCK PIN
Floating
V
DD
V
SS
BLOCK DIAGRAM
XT
XT
HKS
HFI
SYSTEM CLOCK
GENERATOR
LOCK
MODE
CONTROL
LOGIC
READ/WRITE
COUNTER
ROW
(R1 to R4, Vx)
KEYBOARD
INTERFACE
KT
COLUMN
(C1 to C4)
T/P MUTE
PULSE
RAM
CONTROL
LOGIC
LOCATION
LATCH
DP
HFO
ROW & COLUMN
PROGRAMMABLE
COUNTER
D/A
CONVERTER
DATA LATCH
& DECODER
DTMF
Publication Release Date: May 1997
Revision A2
- 5 -
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