HT82K28 datasheet(6/20 Pages) HOLTEK

6 / 20 page

HT82K28A

February 16, 2000

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

System command table

Command

mode 1

mode 2

mode 3

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

HT82K28 数据表(PDF) 6 Page - Holtek Semiconductor Inc

HT82K28 数据表(HTML) 6 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

数据表下载