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Refer to (7)~(8) of WAVEFORM (P.38) for waveform.

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Refer to (9) of WAVEFORM (P.38) for waveform.

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GND

+

3.3V

GND

R9~R0

C5~C0

D7-0

A6-0

WEN

REN

CSN

INTON

INTIN

PDX0

PDX1

PDR

Function Key 46

KEYIN6-1

KEYOUT8-7

+3.3V

GND

DATA

COMUNICATION

TEL

JACK

JK2

XDP

CN

CN13

IC3

 CPU

H8/3627S

ROM : 60kB

RAM : 2kB

OSX,OSR,OSYNC,OCK2M,RESETOUT

RESET

IC1

JK1(HS JACK)

MIC

CN6

SP

CN7

TO

GND

TO

USB

HOOK

RESET

MAIN P. C. Board 

SCLK,TxD,RxD,TxEN,RxRDY,BUSY,OPDET

PBX I/F

 OPTION I/F

LED's driver

CPU I/F

DSP

CORE

DTMF.Gen.

TONE.Gen.

TONE Det.

CODEC

IC4

MIC

SP

LED

CO1~24(2color)

Function LED 8

LED's driver(Tr)

Q3~7, Q11~13

LED

Function LED 1

D133

Function Key

12

X1

16.384MHz

+

3.3V

+3.3V

TO

LCD

CN1

HOOK

SW

SO,SCL,A0,RES,CS1

HF

COMP

IC5

 ASIC

EEPROM 128bit

IC9

LIGHT

TO

LIGHT

CN2

SP

MIC

JK4(HEADSET JACK)

POWER

IC6

PCM

I/F

Q1

IC2

8.196MHz

D6

T1

OSX,OSR,OSYNC,OCK2M,RESETOUT

SCLK,TxD,RxD,TxEN,RxRDY,BUSY,OPDET

DPTS I/F

COMP

DATA

COMUNICATION

Q8,Q9

Q2

Q15

IC7

LED

Message

D130-132

CN4-CN5

ECHO

CHANCELLOR

DDX0

DDX1

DDR

CLK

DATA

CS

-1.2V

IC8

,C11,12

D1,13

Charge Pump

GAIN

 CONTROLLER

DXDP

XDP

JACK

JK3

Q16

CONNECTOR

CN3

CONNECTOR

CN8-CN9

CONNECTOR

CN11-CN12

KEYIN8-1

KEYOUT8-1

OPTION

CN10

OPTION

KX-T7636RU-B : BLOCK DIAGRAM

15

The key data is under the matrix control by 19 to 23, 25, 44, 45(KEYOUT) and 28 to 35(KEYIN) of IC3.
The key information outputted from KEYOUT is inputted into KEYIN, when the key is pressed.

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