HT82K28 データシートの表示（PDF） - Holtek Semiconductor

部品番号

コンポーネント説明

メーカー

HT82K28

Win98 Keyboard Encoder

Holtek Semiconductor 

System command table

Command

FF - reset

FE - resend

FD - set key type make

FC - set key type make/break

FB - set key type typematic

FA - set all keys typematic/make/break

F9 - set all keys make

F8 - set all keys make/break

F7 - set all keys typematic

F6 - set default

F5 - default disabled

F4 - enable

F3 - set typematic rate/delay

F2 - Read ID

F1 -

F0 - select alternate scan codes

EF -

EE - Echo

ED - set/reset status indicators

mode 1

y

y

y

y

y

y

y

y

y

y

y

y

y

y

x

y

x

y

y

HT82K28A

mode 2

y

y

y

y

y

y

y

y

y

y

y

y

y

y

x

y

x

y

y

mode 3

y

y

y

y

y

y

y

y

y

y

y

y

y

y

x

y

x

y

y

The keyboard should respond within 20ms, ex-

cept when performing the BAT or executing a

reset command.

Command description

· Default disable - F5

¨ Send an acknowledge FA to the system

¨ Clear its output buffer, FIFO

¨ Set the default key types

¨ Set typematic rate/delay as default value

¨ Clear the last typematic key

¨ Stop scanning and wait for further instruc-

tion

· Echo - EE

¨ Send an EE to the system

¨ Continue scanning if the keyboard is en-

abled

Note: This command does not need to feed

back the ACK

· Enable - F4

¨ Send an ACK to the system

¨ Clear output buffer

¨ Clear the last typematic key

¨ Start scanning

· Invalid command

¨ Send an FE to the system

¨ No further activities

Note: No ACK

· Read ID - F2

¨ Send an ACK to the system

¨ Discontinue scanning

¨ 2 byte ID-AB, 83

The 2nd byte must follow the completion of

the first byte within 500ms

¨ Resume scanning

6

February 16, 2000

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