BLOCK DIAGRAM
W91210 SERIES
HKS
MODE
XT XT
SYSTEM CLOCK
GENERATION
ROW
(R1 to R4)
COLUMN
(C1 to C3)
DTMF
KEYBOARD
INTERFACE
READ/WRITE
COUNTER
RAM
LOCATION
LATCH
CONTROL
LOGIC
PULSE
CONTROL
LOGIC
T/P MUTE
DP/C4
D/A
CONVERTER
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
FUNCTIONAL DESCRIPTION
Keyboard Operation
C1
C2
C3
DP /C4
1
2
3
F1
R1
4
5
6
F2
R2
7
8
9
F3
R3
*/T
0
#
R/P
R4
• */T: * and P→T key
• R/P: Redial and pause function key
• F1, F2, F3: Flash keys
Normal Dialing
OFF HOOK , D1 , D2 , …, Dn
1. D1, D2, ..., Dn will be dialed out.
2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits.
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