EM84520
2-IN-ONE SCROLLING MOUSE CONTROLLER
c). The counter accumulators are cleared after receiving any command except “Resend”.
d). EM84520 receives a Resend command ( FE ), it transmit its last packet of data.
e). In the stream mode “Resend” is received by EM84520 following a 3-byte data packet transmission
to the system. EM84520 resend the 3-byte data packet prior to clearing the counter.
f). A response is sent within 25 ms if
a). The system requires a response
b). An error is detected in the transmission
g). If EM84520 is in the stream mode :
a). The system disables EM84520 before issuing any command requiring a response.
b). When a command requiring a response is issued by the system ,another command should not be issue
until either the response is received or 25ms has passed.
E). PS/2 Mouse Commands Description:
There are 16 valid commands that transmits between the system and EM84520. The “FA” code is always the
first response to any valid input received from the system other than a Set Wrap Mode or Resend command.
The following table list the commands:
Hex Code
Command
EM84520 echo code
FF
Reset
FA,AA,00
FE
Resend
XX,(XX,XX)
F6
Set Default
FA
F5
Disable
FA
F4
Enable
FA
F3,XX
F2
F0
Set Sampling Rate
Read Device Type
Set Remote Mode
Set Wrap Mode
Reset Wrap Mode
Read Data
Set Stream Mode
Status Request
Set Resolution
Set Auto-speed
Reset Auto-speed
FA,FA
FA,00
FA
FA
EE
EC
EB
EA
E9
E8,XX
E7
FA
FA,XX,XX,XX
FA
FA,XX,XX,XX
FA,FA
FA
E6
FA
The following describes valid commands:
a). Reset ( FF )
EM84520 operation:
a). Completion the reset.
b). Transmitted FA, AA, 00 to the system.
6.28.1999
* This specification are subject to be changed without notice.
6
ELAN [ ELAN MICROELECTRONICS CORP ]
