W91550DN SERIES
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
(R1 ~ R4)
COLUMN
(C1 ~ C6)
DTMF
XT XT
SYSTEM CLOCK
GENERATOR
KEYBOARD
INTERFACE
D/A
CONVERTER
READ/WRITE
COUNTER
CONTROL
LOGIC
LOCATION
LATCH
RAM
PULSE
CONTROL
LOGIC
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
BACKPLAN SIGNAL
GENERATOR
COM1 COM2 COM3
SEGMENT OUTPUT
DECODER
L.C.D.
HKS
B/M
MODE
LOCK
TEST
ATS
S/M
HFI
T/P MUTE
HPM MUTE
KMUTE
DP
HFO
-6-