KBD42W11 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

KBD42W11

Keyboard Controller

SMSC -> Microchip 

BLOCK DIAGRAM

T0

T1

XOUT

XIN

nWR

nRD

nCS

A2

nRESET

RECEIVE

CONTROL

HARDWIRE

CONTROL &

SELECT

LOGIC

SCAN

CODE

ROM

D0 - D7

DATA

BUFFER

REGISTER

R64

W60

W64

STATUS

BUFFER

REGISTER

INPUT

BUFFER

REGISTER

R60

OUTPUT

BUFFER

REGISTER

TRANSMIT

CONTROL

TRANSMIT

REGISTER

STATUS

REGISTER

INPUT &

OUTPUT

PORT

INTERFACE

OUTPUT

PORT

INTERFACE

P1 0

P1 1

P1 2

P1 3

P1 4 (RAM Select)

P1 5 (Manufacture Mode)

P1 6 (Display)

P1 7 (KBNH)

P2 0 (nRC)

P2 1 (Gate A20)

P2 2

P2 3

P2 4

P2 5

P2 6 (Keyboard Clock)

P2 7 (Keyboard Data)

5

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