EKK8011A ELAN Microelectronics Corp, EKK8011A Datasheet - Page 12

• Manufacturer Part Number: EKK8011A
• Description: Usb & Ps/2 Keyboard Encoder
• Manufacturer: ELAN Microelectronics Corp

eKK8011AB
USB & PS/2 Keyboard Encoder
8 • • • •
FB : Typematic
FC : Make/Break
FD : Make
- Returns to previous scanning rate
Resend (Hex FE)
- Sends the previous output again. If the previous byte is RESEND, the last byte before
RESEND shall be sent.
Reset (Hex FF)
- Responds with ACK
- Checks clock and data lines. Reset in the high state for at least 500 µs or receives
another command.
-Default to scan code set 2.
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.
(This specification is subject to change without further notice)
Product Specification (V1.4) 07.10.2006