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參數(shù)資料
| 型號： | HT82K628A |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Windows 2000 Keyboard Encoder(Windows 2000操作系統(tǒng)鍵盤編碼器) |
| 中文描述： | Windows 2000的鍵盤編碼器（Windows 2000的操作系統(tǒng)鍵盤編碼器） |
| 文件頁數(shù)： | 4/25頁 |
| 文件大?。?/td> | 174K |
| 代理商： | HT82K628A |
HT82K628A
4
December 8, 2000
Functional Description
Command from the host
The following table shows the commands that
the host may send and their hexadecimal val-
ues.
Command
Hex Value
Set/Reset Status Indicators
ED
Echo
EE
Invalid Command
EF
Select Alternate Scan Codes
F0
Invalid Command
F1
Read ID
F2
Set Typematic Rate/Delay
F3
Enable
F4
Default Disable
F5
Set Default
F6
Set All Keys - Typematic
F7
Set All Keys - Make/Break
F8
Set All Keys - Make
F9
Make/Break
FA
Set Key Type - Typematic
FB
Set Key Type - Make/Break
FC
Set Key Type - Make
FD
Resend
FE
Reset
FF
The commands may be sent to the HT82K628A
at any time and the HT82K628A will respond
within 25ms except when performing the inter-
nal diagnostics or executing a Reset command.
EDH
Set/Reset status indicators
Three status indicators on the keyboard-Num
Lock, Caps Lock, and Scroll Lock-are accessible
by the host. The HT82K628Aactivates or deac-
tivates these indicators when it receives a valid
command-code sequence from the system. The
command sequence begins with the command
byte (hex ED). The HT82K628A responds to the
command byte with ACK, discontinues scan-
ning, assignments for this option byte are as
follow:
Bit
Indicator
0
Scroll Lock Indicator
1
Num Lock Indicator
2
Caps Lock Indicator
3~7
Reserved (Must be 0)
If a bit for an indicator is set to 1, the indicator
is turned on. If a bit is set to 0, the indicator is
turned off.
The HT82K628A responds to the option byte
with ACK, sets the indicators and if the
HT82K628Awas previously enabled, continues
scanning. The status of the indicators will re-
flect the bits in the option byte and can be acti-
vated or deactivated in any combination. If
another command is received in place of the op-
tion byte, execution of the Set/Reset Mode Indi-
cators command is stopped, with no change to
the indicator status, and the new command is
processed.
Immediately after power-on, the lights default
to the off state. If the Set Default and Default
Disable commands are received, the lamps re-
main in the state they were in before the com-
mand was received.
EEH
Echo
Echo is a diagnostic aid. When the HT82K628A
receives this command, it issues a hex EE re-
sponse and if the HT82K628A was previously
enabled, continues scanning.
EFH and F1H
Invalid command
EFh and F1h are invalid commands and are not
supported. If HT82K628A receives one of these
and sends it, the HT82K628Awill not acknowl-
edge the command, but returns a Resend com-
mand and continues in its previous scanning
state.
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