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參數(shù)資料
| 型號： | HT82K28 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Win98 Keyboard Encoder |
| 中文描述： | Win98鍵盤編碼器 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 143K |
| 代理商： | HT82K28 |
HT82K28A
8
February 16, 2000
b4~b0
Typematic
rate
b4~b0
Typematic
rate
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
30.0
26.7
24.0
21.8
20.0
18.5
17.1
16.0
15.0
13.3
12.0
10.9
10.0
9.2
8.6
8.0
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
7.5
6.7
6.0
5.5
5.0
4.6
4.3
4.0
3.7
3.3
3.0
2.7
2.5
2.3
2.1
2.0
Default
delay: 500ms 20%
typematic rate=10.9 characters/sec 20%
Commands to the system
00:keyboarddetectaerror/overrun(set2,set3)
AB,83: keyboard ID
AA: BAT completion
FC: BAT failure
EE: Echo
FA: Acknowledge
FE: Resend
FF: Keyboard detects a overrun (set 1)
FA: Acknowledge
If the KB (Keyboard) receives any valid input
except EE (echo) and resend (FE) then send
an FA to the system first.
If the command is EE, then send an EE back
to the system.
If the command is FE, then send the last key
code to system.
If there is an interrupt while sending FA, the
KB discards the FA and accepts the command
from the system and processes it.
00/FF: Key overrun
If the keyboard detects an overrun error, the
KBsendsanoverrunerrorcodetothesystem.
mode 1: FF
mode 2,3: 00
FE: Resend
The KB issues an FE when there is a parity
error in transmission.
Data communications
Data output
If CLK=0, no transmission (keyboard inhib-
ited).
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 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 state of the clock
line at intervals of no more than 10ms
If a system request-to-send is detected, the
keyboard 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 level on the "data" line. If the line
is active it is forced to be inactive, and
counts one more bit.
Note: This action signals the system that
the keyboard has received its data.
Upon reception of this signal, the
system returns 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 level following the 10th bit, a frame
error has occurred, and the keyboard contin-
ues to count until the "data" line becomes ac-
tive. The keyboard then makes the "data" line
inactive and sends a Resend.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT82K28A | Win98 Keyboard Encoder |
| HT82K628A | Windows 2000 Keyboard Encoder(Windows 2000操作系統(tǒng)鍵盤編碼器) |
| HT82K628 | Windows 2000 Keyboard Encoder |
| HT82K629A | Windows 2000 USB+PS/2 Keyboard Encoder |
| HT82K68A-L | Multimedia Keyboard Encoder 8-Bit MCU |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT82K28A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Win98 Keyboard Encoder |
| HT82K28A_02 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Win98 Keyboard Encoder |
| HT82K628 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Windows 2000 Keyboard Encoder |
| 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 |
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