EKK8301 ELAN Microelectronics Corp, EKK8301 Datasheet - Page 9

• Manufacturer Part Number: EKK8301
• Description: Keyboard Encoder
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 08.07.2002
(This specification is subject to change without further notice)
6.5 Command from the System
The system can send commands to the keyboard at any time. The keyboard needs
to respond within 20 milliseconds, unless the system prevents keyboard output, when
doing self test or executing a RESET. The following are the keyboard input
commands and the actions that keyboard needs to take.
Set/Reset Status indicators (Hex ED)
- Responds ACK.
- Receives option byte.
- Responds ACK.
- Updates status indicators.
- Returns to previous scanning state.
Echo (Hex EEH)
- Responds with EE hex.
- Returns to previous scanning state.
Invalid commands (Hex EF and F1)
- Returns a RESEND command.
- Returns to previous scanning state.
Select Alternate Scan Codes (Hex F0)
- Responds ACK.
- Clears output buffer.
- Sets the default typematic rate/delay.
- Clears last typematic key.
- Receives option byte.
- Responds ACK.
- Option byte =
- Returns to previous scanning rate.
01 : selects scan code set 1
02 : selects scan code set 2
03 : selects scan code set 3
Keyboard Encoder
eKK8301
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