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參數(shù)資料
| 型號： | HT82K629A |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Windows 2000 USB+PS/2 Keyboard Encoder |
| 中文描述： | Windows 2000中的USB PS / 2鍵盤編碼器 |
| 文件頁數(shù)： | 6/23頁 |
| 文件大?。?/td> | 168K |
| 代理商： | HT82K629A |
HT82K629A
Rev. 1.30
6
April 16, 2004
Commands to the Host
The following table shows the commands that the
HT82K629A may send to the host and their hexadeci-
mal values.
Command
Hex Value
Key Detection Error/Overrun
00 (Code Set 2)
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
TheHT82K629Asendsakeydetectionerrorcharacterif
conditions in the keyboard make it impossible to identify
a switch closure. If the HT82K629A is using scan code
set 1, the code is FFH. For sets 2, the code is 00H.
00H or FFH
Overrun
An overrun character is placed in the HT82K629Abuffer
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 HT82K629Ais
using scan code set 1, the code is FFH. For sets 2, the
code is 00H.
83AbH
Keyboard ID
The keyboard ID consists of 2 bytes, Hex 83AbH. The
HT82K629Aresponds 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 HT82K629A begins scanning.
EEH
Echo
The HT82K629A sends this code in response to an
Echo command.
AAH
BAT Completion Code
Following a satisfactory completion of the BAT, the
HT82K629A sends AAH. Any other code indicates key-
board failure.
FCH
BAT Failure Code
If a BATfailure occurs, the HT82K629Asends this code,
discontinues scanning and waits for a host response or
reset.
FEH
Resend
The HT82K629A issues a Resend command following
receipt of an invalid input or any input with incorrect par-
ity. If the host sends nothing to the HT82K629A, 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 ev-
ery 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 bits.
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.
Data Stream
Mode 1,2,3
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
Start bit (always 0)
Data bit 0
Data bit 1
Data bit 2
Data bit 3
Data bit 4
Data bit 5
Data bit 6
Data bit 7
Parity bit (odd par)
Stop bit (always 1)
Note:
Theparitybitiseither1or0,andthe 8databits,
plus the parity bit, always have an odd number
of 1 s.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT82K68A-L | Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K68E-L | Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K68A | 8-Bit High Performance Peripheral Interface IC For Multiple I/O Products and Multimedia Applications(8位高性能外圍接口集成芯片，用于多I/O口及多媒體器件) |
| HT82K68E | 8-Bit High Performance Peripheral Interface IC For Multiple I/O Products and Multimedia Applications(8位高性能外圍接口集成芯片，用于多I/O口及多媒體器件) |
| HT82K68 | Multimedia Keyboard Encoder OTP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| HT82K68 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Multimedia Keyboard Encoder OTP |
| HT82K68A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Multimedia Keyboard Encoder Body |
| HT82K68A_01 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Multimedia Keyboard Encoder Mask MCU |
| HT82K68A-L | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Multimedia Keyboard Encoder 8-Bit MCU |
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