EM83702
ALL IN ONE MOUSE CONTROLLER
PIN ASSIGNMENTS
EM83702A
EM83702B
RS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD
RS
OPT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD
MS
OPT
Y2
Y1
X2
X1
L
Y2
Y1
X2
X1
L
OSC.IN
OSC.OUT
RTS
MS
OSC.IN
OSC.OUT
RTS
RXD
VSS
RXD
M
R
M
VSS
R
FUNCTIONAL BLOCK DIAGRAM
I
D
E
T
E
C
T
O
R
OPT
X1
M
M
U
N
I
N
O
I
M
O
T
I
P/S
MULTIPLEXER
COUNTER
S
E
X2
Y1
Y2
O
N
T
Y
D
E
B
O
U
N
C
E
L
TIMING
M
R
MODE
SELECTOR
CONTROLLER
MS
RS
OSC.OUT
RXD
LEVEL-SHIFT
CIRCUIT
SYSTEM CLOCK
GENERATOR
OSC.IN
RTS
PIN DESCRIPTIONS
Symbol
I/O
Function
RS
I
Crystal type select : "0" or floating, select 32.768KHz crystal. "1" select 3.58MHz
resonator.
MS
I
When this pin is connected to VDD, then EM83702 is assigned to operate
under the microsoft mode only. If the pin is connected to VSS , then EM83702
will operate under the mouse system mode.
However if this pin is "floating", then EM83702 is on the “power on initiation”
situation and if any one of three buttons is chosen, thence EM83702 will operate
under the mouse mode. And while the whole system is on “power on initiation”.No
key is chosen then operation will be under microsoft mode.
OSC.IN
OSC.OUT
I
I
A built-in inverter provides oscillation with 32.768 KHz crystal or 3.58MHz
resonator.
Several counters used to decrease the frequency of oscillation and create 1200 baud
rate, key-switches debounce and photo-couple sensor scanning clock,etc.
Positive power input.
RTS
The signal is sent by mouse driver from computer to the mouse to select
a mode. During the reset time, EM83702 echoes the selected mode to the RXD line
after the reset pulse signal of the RTS line. RXD will send out CD(H) code if
it is under the microsoft mode. RXD will send out two byte C8(H) code if it is under
the mouse system mode in EM83702.
* This specification are subject to be changed without notice.
4.15.1996
2
ELAN [ ELAN MICROELECTRONICS CORP ]
