HT82K628 Holtek Semiconductor Inc, HT82K628 Datasheet - Page 6

• Manufacturer Part Number: HT82K628
• Description: Windows 2000 Keyboard Encoder
• Manufacturer: Holtek Semiconductor Inc

F5H - Default disable
The Default Disable command resets all condi-
tions 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.
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 oper-
ation only) and typematic rate/delay, and clears
the last typematic key then continues scanning.
F7H, F8H, F9H, FAH - Set all keys
These commands instruct the HT82K628A to
set all keys to the type listed below:
The HT82K628A will respond with ACK, clears
its output buffer, sets all keys to the type indi-
cated by this command, and continues scanning
(if it was previously enabled). Although these
commands can be sent using any code set, they
affect only scan code set 3 operation.
Hex Value
FA
F7
F8
F9
Set All Keys-Typematic
Set All Keys-Make/Break
Set All Keys-Make
Set All Keys-Typematic
/Make/Break
Command
Preliminary
6
FBH, FCH, FDH - Set key type
These commands instruct the HT82K628A to
set individual keys to the type listed below:
The HT82K628A will respond with ACK, clears
its output buffer and prepares to receive key
identification. Key identification is accom-
plished 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
identification. The type of each identified key is
set to the value indicated by the command.
Although these commands can be sent using
any code set, they affect only scan code set 3 op-
eration.
FEH - Resend
The host sends this command when it detects
an error in any transmission from the
HT82K628A. It is sent only after a data trans-
mission and before the host allows the next
data output. When a Resend is received, the
HT82K628A sends the previous output again
(unless the previous output was Resend, in
which case the HT82K628A sends the last byte
before the Resend command).
Hex Value
FB
FC
FD
Set Key Type-Typematic
Set Key Type-Make/Break
Set Key Type-Make
Command
HT82K628A
July 20, 2000