HT82K628A 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT82K628A Datasheet PDF : 18 Pages
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F3H - Set Typematic Rate/Delay
The host issues the Set Typematic Rate/Delay com-
mand to change the typematic rate and delay. The
HT82K628A responds to the command with ACK, stops
scanning and waits for the system to issue the rate/de-
lay 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 previ-
ously 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 is received instead
of the rate/delay value byte.
HT82K628A
F4H - Enable
Upon receipt of this command, the HT82K628A will re-
spond with ACK, clears its output buffer, clears the last
typematic key, and starts scanning.
F5H - Default Disable
The Default Disable command resets all conditions to
the power on default states. The HT82K628A will re-
spond with ACK, clears its output buffer, sets the default
key types (scan code set 3 operation only) and
typematic rate/delay, and clears the last typematic key.
The HT82K628A then stops scanning and awaits further
command.
F6H - Set Default
The Set Default command resets all conditions to the
power on default states. The HT82K628A will respond
with ACK, clears its output buffer, sets the default key
types (scan code set 3 operation only) and typematic
rate/delay, and clears the last typematic key then contin-
ues scanning.
F7H, F8H, F9H, FAH - Set All Keys
These commands instruct the HT82K628A to set all
keys to the type listed below:
Hex Value
Command
F7
Set All Keys-Typematic
F8
Set All Keys-Make/Break
F9
Set All Keys-Make
FA
Set All Keys-Typematic/Make/Break
The HT82K628A will respond with ACK, clears its output
buffer, sets all keys to the type indicated by this com-
mand, and continues scanning (if it was previously en-
abled). Although these commands can be sent using
any code set, they affect only scan code set 3 operation.
FBH, FCH, FDH - Set Key Type
These commands instruct the HT82K628A to set indi-
vidual keys to the type listed below:
Hex Value
FB
FC
FD
Command
Set Key Type-Typematic
Set Key Type-Make/Break
Set Key Type-Make
The HT82K628A will respond with ACK, clears its output
buffer and prepares to receive key identification. Key
identification is accomplished by the host identifying
each key by its scan code value as defined in scan code
set 3. Only scan code set 3 values are valid for key iden-
tification. The type of each identified key is set to the
value indicated by the command. Although these com-
mands can be sent using any code set, they affect only
scan code set 3 operation.
Rev. 1.60
4
April 16, 2004
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