EM83702

ALL IN ONE MOUSE CONTROLLER

2

* This specification are subject to be changed without notice.

4.15.1996

PIN ASSIGNMENTS

RS

MS

OSC.IN

OSC.OUT

RTS

RXD

VSS

R

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

OPT

Y2

Y1

X2

X1

L

M

EM83702A

RS

OPT

MS

OSC.IN

OSC.OUT

RTS

RXD

VSS

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Y2

Y1

X2

X1

L

M

R

EM83702B

FUNCTIONAL BLOCK DIAGRAM

M

O

T

I

O

N

D

E

T

E

C

T

O

R

N

O

I

S

E

I

M

M

U

N

I

T

Y

D

E

B

O

U

N

C

E

SYSTEM CLOCK

GENERATOR

LEVEL-SHIFT

CIRCUIT

MODE

SELECTOR

TIMING

CONTROLLER

P/S

MULTIPLEXER

COUNTER

RXD

OPT

X1

X2

Y1

Y2

L

M

R

MS

OSC.OUT

RS

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 V

under the microsoft mode only. If the pin is connected to V

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

I

A built-in inverter provides oscillation with 32.768 KHz crystal or 3.58MHz

OSC.OUT

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.

RTS

I

Positive power input.

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.