eKK6111
RF Keyboard Decoder
6.2 Power-on Reset and Self Test
The duration of the decoder Power-on-Reset (POR) should be within 150 milliseconds
and 2 seconds after the power is applied to the decoder.
After executing POR, the receiver executes a self test. The LEDs are turned in at the
beginning and off at the end of the self test. The self test takes a minimum 300
milliseconds and a maximum 500 milliseconds. If the self test is successful, A
completion code AA hex is sent to the system and the decoder starts read and decode
the data from RF Rx module. If self test fails, and error code is sent, the decoder is
disabled and waits for command from the system. The completion codes are sent
between 450 milliseconds and 2.5 seconds after POR, and between 300 and 500
milliseconds after RESET command is acknowledged.
6.3 Decoder Data Output
When the decoder is ready to send data to the system, it first checks clock and data
lines. If either one is in the low state, data is stored in the buffer. If both are in the high
state, decoder starts clocking data out. Data will be valid before the trailing edge and
after the leading edge of the clock pulse. During the transmissions the decoder checks
the clock line at least 60 microseconds. If the system lowers the clock lines before
leading edge of the 10th clock, the decoder should stop sending, then buffer the data
and return clock and data to high state.
6.4 Decoder Data Input
When the system is ready to send data to the decoder, it first checks line to see if
decoder is sending data. If decoder is not sending data or it is sending data but has not
reached the 10th clock, the system can inhibit the interface by forcing the clock line low
for more than 60 microseconds and prepares to send data. The decoder checks clock
line status at least every 5 milliseconds. If a system Request to Send (RTS) is
detected, the decoder clocks 11 bits in. After 10th bit, the decoder checks for high state
in data line then pulls it low and clocks one more bit to signal the system that data has
been received. If data is low after the 10th bit, it indicates a frame error. The decoder
should continue to count until data line goes high, then pulls it low and issues a
RESEND to the system.
6.5 Device ID
The EM83110A has support two device ID mode:
ꢀ
ꢀ
Controllable ID mode: Using the 3 bits DIP switch to control the device ID.
Random generate ID mode: Using the push bottom to entry the device ID set
mode. The EM83110A will receives 10 seconds the new device ID after push
bottom pressed. When PC reset, the device ID will recovery from EEPROM.
Product Specification (V1.0) 11.15.2002
• 3
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
