W91620 Datasheet, PDF (4/16 Pages) Winbond – 10-MEMORY TONE/PULSE DIALER WITH TWO-STAGE REDIAL FUNCTION

BLOCK DIAGRAM
W91620 SERIES
HKS
MODE
XT XT
SYSTEM CLOCK
GENERATION
ROW
(R1 to R4)
COLUMN
(C1 to C4)
DTMF
KEYBOARD
INTERFACE
READ/WRITE
COUNTER
RAM
LOCATION
LATCH
CONTROL
LOGIC
PULSE
CONTROL
LOGIC
T/P MUTE
P MUTE
DP/C5
D/A
CONVERTER
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
FUNCTIONAL DESCRIPTION
Keyboard Operation
C1 C2 C3 C4 DP / C5
1 2 3 S P→T R1
456F
P
R2
789A
R3
* 0#R
R4
• S: Store function key
• F: Flash key
• P→T: In pulse mode, this key works as Pulse→Tone key
• R: Redial function key
• A: Indirect repertory dialing key
• P: Pause key
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