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參數資料
| 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： | 4/20頁 |
| 文件大?。?/td> | 143K |
| 代理商： | HT82K28 |
HT82K28A
4
February 16, 2000
Functional Description
The HT82K28A basic function is to detect key
press and release activity and to transmit the
corresponding scan code, as well as make and
break codes to the system.
The device also accepts commands from the sys-
tem and responds to the system if necessary. All
communication between the keyboard and the
system is managed through the CLOCK and
DATA pins.
The keyboard begins to scan for pressed or re-
leased keys and commands from the system after
the BAT (Basic Assurance Test) has been run.
Working modes
Three working modes are supported by the
HT82K28A. These are setup by the alternate
scan code command F0. The various modes are
described as follows.
Mode 1
Supports code set 1 for PS/2 model 30 key-
boards.
Enters mode1 after an F0 Command is issued
followed by a 1".
Contains an 11 bit data stream, including one
start bit (always zero) eight data bits, one par-
ity bit (odd parity) and one stop bit (always
one).
Allkeysaretypematic/make/breakasdefault.
The working mode can be changed again in
this mode, by issuing an F0 command fol-
lowed by an option. See the F0 command for
more detail.
Mode 2
Supports code set 2 for PC/AT, PS/2 model 50,
60 keyboards.
Enters mode 2 after power on.
The working mode can be changed by an F0
command followed by an option byte 1, 2 or 3.
See the F0 command for more details.
Contains an 11 bit data stream, including one
start bit (always zero) eight data bits, one par-
ity bit (odd parity) and one stop bit (always
one)
Allkeysaretypematic/make/breakasdefault.
Mode 3
Supports code set 3, for PS/2 model 80 key-
boards.
Enters mode 3 when an F0 command is issued
followed by a 3".
Contains an 11 bit data stream, including one
start bit (always zero) eight data bits, one par-
ity bit (odd parity) and one stop bit (always
one).
Buffers
The buffers support the following functions:
16-byte FIFO buffer: stores 16 keystrokes
scan codes.
Additional keystrokes will be ignored.
Response codes, i.e FA/FE... do not occupy
buffer positions.
Basic assurance test
BAT
The following functions are offered by the Basic
Assurance Test:
Turns on LED status indicators.
Keyboard processor test.
RAM test.
Turns off LED status indicators, i.e. the
LEDs.
Reports the BAT result to the system.
Note: During the BAT, activity on the "clock"
and "data" line are ignored. The LED s
are turned on at the beginning and
turned off at the end of the BAT. The
BAT takes a minimum of 450ms after
POR and a maximum of 2.5s. The re-
sponse to a satisfactory BAT completion
is AA
and response to BAT failure is
an FC error. The reset keyboard com-
mand FF will also cause the keyboard
to execute the BAT. Completion codes
are sent between 300 and 500ms after a
reset command is acknowledged. After
the BAT, the keyboard sets the keys to
typematic and make/break, and sets the
default typematic rate and delay.
相關PDF資料 |
PDF描述 |
|---|---|
| HT82K28A | Win98 Keyboard Encoder |
| HT82K628A | Windows 2000 Keyboard Encoder(Windows 2000操作系統鍵盤編碼器) |
| HT82K628 | Windows 2000 Keyboard Encoder |
| HT82K629A | Windows 2000 USB+PS/2 Keyboard Encoder |
| HT82K68A-L | Multimedia Keyboard Encoder 8-Bit MCU |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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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