EKK8301 データシートの表示（PDF） - ELAN Microelectronics

部品番号

コンポーネント説明

メーカー

EKK8301

Keyboard Encoder

ELAN Microelectronics 

eKK8301

Keyboard Encoder

6.6 Command to the System

The following are the keyboard output commands.

Acknowledge (Hex FA)

The keyboard sends and acknowledge in response to any valid command from the

system except for RESEND and ECHO.

BAT Completion Code (Hex AA)

This command is issued after successful completion of keyboard self test.

Echo (Hex EE)

The keyboard sends this code in response to an ECHO command.

Keyboards ID (Hex 83 AB)

The 2 byte ID is issued to respond to READ ID command. The low byte is sent first,

followed by the high byte.

Keyboard buffer Overrun (Hex 00 or FF)

If keyboard buffer overflows, the overrun code will replace the last byte in the buffer.

If the keyboard is using scan code set 1, the code is hex FF. For sets 2 and 3, the

code is hex 00.

Resend (Hex FE)

When the keyboard receives an invalid input or any input with incorrect parity, the

RESEND command is sent.

6.7 Keyboard Scan Code Table

The keyboard contains 3 scan code sets. The system defaults to scan code set 2,

but can be switched to set 1 or set 3. The following tables show the key numbers and

three scan code sets in hexadecimal values. All the keys are typematics except for

the pause key. When a key is pressed down, the make scan code is sent to the

system. When the key is released, its break code is sent. If two or more keys are

held down, only the last key pressed repeats at the typematic rate. Typematic

operation stops when the last pressed key is released, even if other keys are being

released or some other keys are still held down.

Product Specification (V1.0) 08.07.2002

9

(This specification is subject to change without further notice)

Share Link: