EM84520
2-IN-ONE SCROLLING MOUSE CONTROLLER
This command is executed in either remote or stream mode. The data is transmitted even if there has been
no movement since the last report or the button status is unchanged. Following a Read Data command,
the registers are cleared after a data transmission.
l). Set Stream Mode ( EA )
This command sets EM84520 in stream mode.
m). Status Request ( E9 )
When this command is issued by the system, EM84520 respond with a 3-byte status report as follows:
Byte
1
Bit
0
1
2
3
Description
1 = Right button pressed
1 = Middle button pressed
1 = Left button pressed
Reserved
4
5
6
7
0 = Normal speed, 1 = Autospeed
0 = Disabled, 1 = Enabled
0 = Stream mode, 1 = Remote mode
Reserved
2
3
0-7
0-7
Current resolution setting ( D0 - D7 )
Current sampling rate ( D0 - D7 )
n). Set Resolution ( E8,XX )
EM84520 provides four resolutions selected by the second byte of this command as follows:
Second Byte XX
00
Resolution
8 dots/count
01
02
03
4 dots/count
2 dots/count
1 dot/count
o). Set Autospeed ( E7 )
At the end of a sample interval in the stream mode, the current X and Y data values are converted new values.
The sign bits are not involved in this conversion. The conversion is only in stream mode. The relationship
between the input and output count follows:
Input
0
Ouput
0
1
2
3
4
1
1
3
6
9
5
N(≥6 )
2.0*N
p). Reset Autospeed ( E6 )
This command restore normal speed.
6.28.1999
* This specification are subject to be changed without notice.
8
ELAN [ ELAN MICROELECTRONICS CORP ]
