EM84510
PS/2 SCROLLING MOUSE CONTROLLER
FUNCTION DESCRIPTIONS
Legacy PS/2 mouse operating:
(A) Operating mode
There are four operating modes in PS/2 mouse:
a. Reset Mode:
In this mode a self-test is initiated during power-on or by a Reset command. After reset signal, PS/2 mouse
will send:
(a) Completion code AA & ID code 00.
(b) Set default :
sampling rate: 100 reports/s
non-autospeed
stream mode
2 dot/count
disable
b. Stream Mode:
The maximum rate of transfer is the programmed sample rate.
Data report is transmitted if
(a) switch is pressed
(b) movement has been detect
c. Remote Mode:
Data is transmitted only in response to a Read Data command.
d. Wrap Mode:
Any byte of data sent by the system, except hex EC ( Reset wrap mode ) or hex FF ( Reset ), is returned
by EM84510.
B). PS/2 Mouse Data Report:
i). In stream mode: A data report is sent at the end of a sample interval.
ii). In remote mode: A data report is sent in response to Read Data command.
iii). Data report format:
Byte
Bit
Description
1
0
1
2
3
Left button status; 1 = pressed
Right button status; 1 = pressed
Middle button status; 1 = pressed
Reserve
4
5
6
7
0-7
0-7
X data sign; 1 = negative
Y data sign; 1 = negative
X data overflow; 1 = overflow
Y data overflow; 1 = overflow
X data ( D0 - D7 )
2
3
Y data ( D0 - D7 )
* This specification are subject to be changed without notice.
5.30.2001
3
ELAN [ ELAN MICROELECTRONICS CORP ]
