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參數(shù)資料
| 型號： | HT82K628 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Windows 2000 Keyboard Encoder |
| 中文描述： | Windows 2000的鍵盤編碼器 |
| 文件頁數(shù)： | 5/18頁 |
| 文件大?。?/td> | 145K |
| 代理商： | HT82K628 |
HT82K628A
Rev. 1.60
5
April 16, 2004
FEH
Resend
Thehostsendsthiscommandwhenitdetectsanerrorin
anytransmissionfromtheHT82K628A.Itissentonlyaf-
ter a data transmission and before the host allows the
next data output. When a Resend is received, the
HT82K628A sends the previous output again (unless
the previous output was Resend, in which case the
HT82K628A sends the last byte before the Resend
command).
Commands to the Host
The following table shows the commands that the
HT82K628A may send to the host, and their hexadeci-
mal 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
TheHT82K628Asendsakeydetectionerrorcharacterif
conditions in the keyboard make it impossible to identify
a switch closure. If the HT82K628A is using scan code
set1,thecodeisFFH.Forsets2and3,thecodeis00H.
00H or FFH
Overrun
An overrun character is placed in the HT82K628Abuffer
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
usingscancodeset1,thecodeisFFH.Forsets2and3,
the code is 00H.
83AbH
Keyboard ID
The keyboard ID consists of 2 bytes, Hex 83AbH. The
HT82K628Aresponds to the Read ID with ACK, discon-
tinues scanning and sends 2 ID bytes. The low byte is
sent first followed by the high byte. Following the output
of Keyboard 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
HT82K628A sends AAH. Any other code indicates key-
board failure.
FCH
BAT Failure Code
If a BATfailure occurs, the HT82K628Asends this code,
discontinues scanning and waits for a host response or
reset.
FEH
Resend
The HT82K628A issues a Resend command following
receipt of an invalid input or any input with incorrect par-
ity. If the host sends nothing to the HT82K628A, no re-
sponse is required.
Data Communications
Data output
If CLK=0, no transmission (keyboard is inhibited).
If CLK=1, DATA=0, no transmission (system re-
quest to send).
If CLK=1, DATA=1, transmission permitted.
Data will be valid before the trailing edge and be-
yond 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.
Data input
The system overrides the clock line for at least
60ms.
The keyboard checks the clock line state at inter-
vals of 10ms
If a system request-to-send is detected, the key-
board counts 11 data bits.
Data will be valid before the rising edge and beyond
the falling edge
After the 10th bit, the keyboard checks for an active
levelonthe data line.Ifthelineisactiveitisforced
to be inactive, and counts one more bit.
Note: This action signals the system that the
keyboard has received its data. Upon
receptionofthissignal,thesystemreturns
to the ready state, in which it can accept
keyboard outputs or goes to the inhibit
state until it is ready.
If the keyboard data line is found to be at an inactive
levelfollowingthe10thbit,aframeerrorhasoccurred,
and the keyboard continues to count until the data
line becomes active. The keyboard then makes the
data line inactive and sends a Resend.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT82K628A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Windows 2000 Keyboard Encoder |
| HT82K628A(40DIP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Controller Miscellaneous - Datasheet Reference |
| HT82K628A-40DIPLF | 制造商:Holtek Semiconductor Inc 功能描述:IC WIN 2000 KB PS2 CONT DIP40 制造商:Holtek Semiconductor Inc 功能描述:IC, WIN 2000 KB PS2 CONT, DIP40 制造商:Holtek Semiconductor Inc 功能描述:IC, WIN 2000 KB PS2 CONT, DIP40, IC Function:Keyboard Encoder, Brief Features:Su 制造商:Holtek Semiconductor Inc 功能描述:IC, PS/2 KEYBOARD ENCODER, DIP-40, IC Function:Keyboard Encoder, Brief Features:Supports Japanese, Korean, Brazilian and European, RC Oscillator, Phantom Key Detection, Supply Voltage Min:3V, Supply Voltage Max:5.25V, No. of Pins:40 , RoHS Compliant: Yes |
| HT82K629A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Windows 2000 USB+PS/2 Keyboard Encoder |
| HT82K629A-40DIPLF | 制造商:Holtek Semiconductor Inc 功能描述:IC USB/PS2 CONT WIN 2000 KEYBOARD 制造商:HOLTEK 功能描述:IC, USB/PS2 CONT, WIN 2000 KEYBOARD 制造商:Holtek Semiconductor Inc 功能描述:USB/PS2 INTERFACE, WINDOWS 2000, DIP-40; USB Type:Keyboard Encoder; USB Version:1.1; Supply Voltage Min:4.4V; Supply Voltage Max:5.5V; Digital IC Case Style:DIP; No. of Pins:40; Operating Temperature Min:0C ;RoHS Compliant: Yes |
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