W91550DN SERIES
- 6 -
Pin Description, continued
SYMBOL
PIN
I/O
FUNCTION
COM1
−
COM3
62, 63, 2
O
COM1
−
COM3 are common signal output terminals for the 1/3 duty
LCD.
1(A, B, C)
−
10(A, B, C)
3
−
33
(unless
26-pin)
O
1(A, B, C)
−
10(A, B, C) are 10-digit segment signal output terminals.
BLOCK DIAGRAM
ROW
COLUMN
DTMF
XT
XT
HKS
MODE
RAM
COUNTER
SYSTEM CLOCK
GENERATOR
LOCATION
LATCH
D/A
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
COM1
COM2
COM3
BACKPLAN SIGNAL
GENERATOR
SEGMENT OUTPUT
DECODER
L.C.D.
READ/WRITE
B/M
TEST
ATS
HFI
(R1 ~ R4)
(C1 ~ C6)
HPM MUTE
T/P MUTE
HFO
KMUTE
CONTROL
LOGIC
PULSE
CONTROL
LOGIC
KEYBOARD
INTERFACE
CONVERTER
LOCK
S/M
DP