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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)： | 5/25頁 |
| 文件大?。?/td> | 174K |
| 代理商： | HT82K628A |
HT82K628A
5
December 8, 2000
F0H
Select alternate scan codes
This command instructs the HT82K628A to se-
lect one of the three sets of scan codes. The
HT82K628A acknowledges receipt of this com-
mand with ACK, clears both the output buffer
and the typematic key. The host then sends the
option byte and the keyboard responds with an-
other ACK. An option byte value of hex 01 se-
lects scan code set 1, hex 02 selects set 2 and
hex 03 selects code set3.
An option byte value of hex 00 causes the
HT82K628A to acknowledge with ACK and
sendsabytetellingthehostwhichscancodeset
is currently in use.
After establishing the new scan code set, the
HT82K628A returns to the scanning state it
was in before receiving the Select Alternate
Scan Codes command.
F2H
Read ID
This command requests identification informa-
tion from the HT82K628A. The HT82K628Are-
sponds with ACK, discontinues scanning and
sends the two keyboard ID bytes hex 83h and
Abh. After the output of the second ID byte, the
HT82K628A resumes scanning.
F3H
Set typematic Rate/Delay
The host issues the Set Typematic Rate/Delay
command to change the typematic rate and de-
lay. The HT82K628A responds to the command
with ACK, stops scanning and waits for the sys-
tem to issue the rate/delay value byte. The
HT82K628A responds to the value byte with
another ACK, sets the rate and delay to the
value indicated, and continues scanning (if it
was previously enabled). Bit6 and 5 indicate
the delay, and bits 4, 3, 2, 1 and 0 indicate the
rate. Bit7 is always 0. The delay is equal to 1
plus the binary value bit 6 and 5, multiplied by
250ms 20%.
The period (interval from one typematic output
to the next) is determined by the following
equation:
Period = (8+A)*(2^B)*0.00417 seconds.
Where:
A = binary value of bits 2, 1, and 0.
B = binary value of bits 4, and 3.
The typematic rate is 1 for each period and are
listed as follows:
Bit
Typematic
Rate
20%
Bit
Typematic
Rate
20%
00000
30.0
10000
7.5
00001
26.7
10001
6.7
00010
24.0
10010
6.0
00011
21.8
10011
5.5
00100
20.0
10100
5.0
00101
18.5
10101
4.6
00110
17.1
10110
4.3
00111
16.0
10111
4.0
01000
15.0
11000
3.7
01001
13.3
11001
3.3
01010
12.0
11010
3.0
01011
10.9
11011
2.7
01100
10.0
11100
2.5
01101
9.2
11101
2.3
01110
8.0
11110
2.1
01111
8.0
11111
2.0
The default values for the HT82K628A are as
follows:
Typematic rate= 10.9 characters per second
20%
Delay = 500ms 20%
The execution of this command stops without
change to the existing rate if another command
isreceivedinsteadoftherate/delayvaluebyte.
F4H
Enable
Upon receipt of this command, the HT82K628A
will respond with ACK, clears its output buffer,
clears the last typematic key, and starts scan-
ning.
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