EKK8301 查看數據表（PDF） - ELAN Microelectronics

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EKK8301

Keyboard Encoder

ELAN Microelectronics 

eKK8301

Keyboard Encoder

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 =

01 : selects scan code set 1

02 : selects scan code set 2

03 : selects scan code set 3

- Returns to previous scanning rate.

Product Specification (V1.0) 08.07.2002

5

(This specification is subject to change without further notice)

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