HT6542B View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

Manufacturer

HT6542B

Keyboard Controller with PS/2

Holtek Semiconductor 

Block Diagram

HT6542B

Pin Description

Pin No.

(DIP)

1

2,3

4

5,7,11,25

6

8

9

Pin No.

(PLCC)

2

3,4

5

1,6,8,12,13,

23,29,34

7

9

10

Pin

Name

I/O

Pin Descriptions

KBCI

I Keyboard clock input pin

OSCI,OSCO

I

System clock input pin, to generate internal

oscillator signal

RES

I

Low level to reset HT6542B. After RES goes to high

level HT6542B needs 10ms to initial internal circuit

NC

— No connection

CS

I Host-interface chip select, active low

RD

I Host-interface read signal, active low

Host-interface address select input. When high, it

A0

I selects the command/status registers; when low it

selects the data register

2

30th Nov ’95

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