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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)： | 7/25頁 |
| 文件大小： | 174K |
| 代理商： | HT82K628A |
HT82K628A
7
December 8, 2000
Commands to the host
The following table shows the commands that
the HT82K628Amay send to the host, and their
hexadecimal values.
Command
Hex Value
Key Detection
Error/Overrun
00 (Code Set 2 and 3)
Keyboard ID
83AB
Bat Completion Code
AA
Bat Failure Core
FC
Echo
EE
Acknowledge
FA
Resend
FE
Key Detection
Error/Overrun
FF (Code Set 1)
00H or FFH
Key detection error
The HT82K628A sends a key detection error
character if conditions in the keyboard make it
impossible to identify a switch closure. If the
HT82K628Ais using scan code set 1, the code is
FFH. For sets 2 and 3, the code is 00H.
00H or FFH
Overrun
An overrun character is placed in the
HT82K628A buffer and replaces the last code
when the buffer capacity has been exceeded.
The code is sent to the host when it reaches the
top of the buffer queue. If the HT82K628Ais us-
ing scan code set 1, the code is FFH. For sets 2
and 3, the code is 00H.
83AbH
Keyboard ID
The keyboard ID consists of 2 bytes, Hex
83AbH. The HT82K628A responds to the Read
ID with ACK, discontinues scanning and sends
2 ID bytes. The low byte is sent first followed by
thehighbyte.FollowingtheoutputofKeyboard
ID, the HT82K628A begins scanning.
EEH
Echo
The HT82K628A sends this code in response to
an Echo command.
AAH
BAT completion code
Following satisfactory completion of the BAT,
the HT82K628Asends AAH. Any other code in-
dicates keyboard failure.
FCH
BAT failure code
If a BAT failure occurs, the HT82K628A sends
this code, discontinues scanning and waits for a
host response or reset.
FEH
Resend
The HT82K628Aissues a Resend command fol-
lowing receipt of an invalid input or any input
with incorrect parity. If the host sends nothing
to the HT82K628A, no response is required.
Data communications
Data output
If CLK=0, no transmission (keyboard is in-
hibited).
If CLK=1, DATA=0, no transmission (sys-
tem request to send).
If CLK=1, DATA=1, transmission permit-
ted.
Data will be valid before the trailing edge
and beyond the leading edge of the clock.
The KB checks the clock line for an active
level of at least every 60ms.
If line contention occurs (system brings the
clock low before the tenth clock), set
clock=data=high.
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