eKK6111
RF Keyboard Decorder
6.6 Command From the System
The system can send commands to the decoder at any time. The decoder needs to
respond within 20 milliseconds, unless the system prevents decoder output, when
doing self test or executing a RESET. The following are the decoder input commands
and he actions that decoder needs to take.
6.6.1 Set/Reset Status Indicators (Hex ED)
Responds ACK.
Receives option byte.
Responds ACK.
Updates status indicators.
Return to previous scanning state.
6.6.2 Echo (Hex EE)
Responds with EE hex.
Returns to previous scanning state.
6.6.3 Invalid commands (Hex EF and F1)
Responds with EE hex.
Returns to previous scanning state.
6.6.4 Select Alternate Scan Code (Hex F0)
Responds ACK.
Clears output buffer.
Sets the default typematic rate/delay.
Clears last typematic key.
Receives options key.
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 state.
4 •
Product Specification (V1.0) 11.15.2002
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
