EKK8011E ELAN Microelectronics Corp, EKK8011E Datasheet - Page 13

• Manufacturer Part Number: EKK8011E
• Description: Usb And Ps/2 Keyboard Encoder
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.2) 07.09.2009
(This specification is subject to change without further notice)
6.1.6 System Commands
The following are the keyboard output commands.
Acknowledge (Hex FA)
The keyboard sends an 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 a successful completion of the keyboard self test.
Echo (Hex EE)
The keyboard sends this code in response to an ECHO command.
Keyboards ID (Hex 83AB)
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 the 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.
FB : Typematic
Resend (Hex FE)
Reset (Hex FF)
FC : Make/Break
FD : Make
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Return to previous scanning rate
Send the previous output again. If the previous byte is RESEND, the last byte
before RESEND shall be sent.
Respond with ACK
Check clock and data lines. Reset in the high state for at least 500µs or
receive another command.
Default to Scan Code Set 2.
USB & PS/2 Keyboard Encoder
eKK8011E
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