HT82K28A_02 HOLTEK [Holtek Semiconductor Inc], HT82K28A_02 Datasheet - Page 4

• Manufacturer Part Number: HT82K28A_02
• Description: Win98 Keyboard Encoder
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

Keys
System command table
Rev. 1.30
FF
FE
FD
FC
FB
FA
F9
F8
F7
F6
F5
F4
F3
F2
F1
F0
EF
EE
ED
For code set 1, 2
All keys except the PAUSE key have a make and
break code. The PAUSE key has a make code only.
The defaults except for PAUSE are make/break/
typematic. In mode 1, 2 and 3 the key type may be
changed to be one of the following:
Typematic
Make/break
Make
Typematic/make/break
All keys except PAUSE are typematic. Typematic
means that the KB keeps sending make codes if the
key is held down.
The data report is according to the typematic
rate/delay:
Default values are: delay 500ms
The typematic rate and delay can be modified with
the F3 command.
If two or more keys are held down, only the last key
pressed repeats at the typematic rate.
Typematic operation stops when the last key
pressed is released even if other keys are still held
down.
set all keys make
set all keys make/break
set all keys typematic
set default
default disabled
enable
set typematic rate/delay
Read ID
select alternate scan codes
reSset
resend
set key type make
set key type make/break
set key type typematic
set all keys typematic/make/break
Echo
set/reset status indicators
Command
10.9 char/sec
20%
20%
mode 1
4
y
y
y
y
y
y
y
y
y
y
y
y
y
y
x
y
x
y
y
Time interval between phantoms
The time interval between two continuous error codes
00/FF sent while phantom detected= 1000ms
The keyboard should respond within 20ms, except
when performing the BAT or executing a reset com-
mand.
For code set 3
If a key is pressed and held down while keyboard
transmission is inhibited, only the first make code is
stored in the buffer overflow as a result of typematic
action.
Four key types are supported as shown:
Note:
Typematic
Make/break
Make
Typematic/make/break
Can be configured by command
Typematic
Make/break
Make
Typematic/
make/break
Key type
until key is released.
make1 send out only one make code.
Make2 continue sending out make codes
X nothing sent out.
mode 2
y
y
y
y
y
y
y
y
y
y
y
y
y
y
x
y
x
y
y
make1
make1
make1
make1
press
make2
make2
hold
X
X
HT82K28A
mode 3
June 27, 2002
y
y
y
y
y
y
y
y
y
y
y
y
y
y
x
y
x
y
y
release
break
break
20%
X
X