EM84520
2-IN-ONE SCROLLING MOUSE CONTROLLER
FUNCTION DESCRIPTIONS
(I) Serial Scrolling Mouse :
In Microsoft mode, the transmission cycle consists of four bytes in one report. Each byte contains one start
bit, 7 data bits and two stop bits. The first byte contains "L", "R" key status and four bits of the two most
significant bits in horizontal counter and vertical counter. The second byte represents the value accumulated
by horizontal counter, the third byte is the data of the vertical counter. The last byte contains "M" key status
and Z-axis value. The vertical data is transmitted in 2's complement.
Output byte arrange
Bit no.
......
......
....
....
....
6
1
0
0
0
5
L
H5
V5'
0
4
R
H4
V4'
M
3
V7'
H3
V3'
Z3
2
V6'
H2
V2'
Z2
1
H7
H1
V1'
Z1
0
H6
H0
V0'
Z0
1st byte
2nd byte
3rd byte
4th byte
Plug & Play ID code
When RTS input from low to high, EM84520 will send a string ID code. Customer can specify the contains
of the code area and the total lenth below 100 bytes by changing the code layer.
Field Name
Other ID
Begin ID
PnP Revision
EISA ID
Length
<17
1
2
3
Field Data
4D, 5A, 40, 00, 00, 00
08
01, 24
Description
ID for legacy
Begin PnP ID
Version 1.00
EMC
25, 2D, 23
Product ID
Serial Number
Class ID
Driver ID
User Name
4
9
<34
<42
<42
10, 10, 10, 11
3C
0001
None provided
Mouse Class
PnP0F0A
EMC SCROLLING
SERIAL MOUSE
3C, 2D, 2F, 35, 33, 25
3C, 30, 2E, 30, 10 26, 10, 21
3C, 25, 2D, 23, 00, 33, 23, 32,
2F, 2C, 2C, 29, 2E, 27, 00, 33,
25, 32, 29, 21, 2C, 00, 2D, 2F,
35, 33, 25
Check sum
End PnP
2
1
21, 15
09
2 bytes checks um
End PnP ID
(II) 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 :
(a) Send completion code AA & ID code 00.
(b) Set default :
* This specification are subject to be changed without notice.
6.28.1999
3
ELAN [ ELAN MICROELECTRONICS CORP ]
