EM83702

ALL IN ONE MOUSE CONTROLLER

3

* This specification are subject to be changed without notice.

4.15.1996

RXD

O

There are 8 or 7 bits in each data byte.

Using parallel-in and serial-out components, the data bytes are shifted out from bit

0 through the high bits. EM83702 will transmit the data while the status of three

keyswitches or the state of the horizontal counter or vertical counter is changed.

V

SS

Negative power input.

R

I

Three key-switches exert seven different combinations totally.

M

I/O

Both key-pressed and key-released signals will be sent accomplanied with

L

I/O

horizontal and vertical state. The status of the key-switches will be preserved,

whenever the value of horizontal or vertical counters will present at RXD. And the

debounce interval for both key-press and key-release is 13 ms.

In testing mode, L and M are the outputs of motion detecdor. Using R key can select

the two outputs X1, X2 or Y1,Y2. This feature can help manufacturer to adjust the

phase of four photo-couples for improving the yield.

X1

I

Four photo-couple signals denote UP, DOWN, LEFT and RIGHT state. If

X2

EM83702 is in 1200 baud rate on non-auto speed mode, the system provides 40

Y1

transmission cycles per second in microsoft mode to the utmost. In mouse system

Y2

mode, the cycles are 24 maxiun. During the scaning period, as long as the photo-

couples change their states, the value of vertical or horizontal counter will increase

or decrease accordingly.

OPT

I

Whenever OPT is connected to V

DD

, the chip will enter testing mode.

V

DD

Power.

Symbol

I/O

Function

FUNCTION DESCRIPTIONS

A) Operating Mode

Mouse system mode

Anytime the mouse changes its state, including the key-switches and the photo-couple sensors, EM83702 will

detect the result and transmit to RS-232C. Mouse system transmits the result with five bytes in 1200 baud

rate. Each byte contains 10 bits, one start bit, one stop bit and eight data bits. The first byte represents

the key-switches status. The second byte denote the number counted by the horizontal counter. The third byte

conveys the number accumulated by the vertical counter. If the mouse is moved faster, the photo-couple

sensors detect the “change state” and output the record, excessive horizontal counter will be transported

through the fourth byte, and vertical counter through the fifth byte. Otherwise, the fourth and fifth byte are zero.

Output bytes arrange:

bit

no ......

7

6

5

4

3

2

1

0

1st

byte......

1

0

0

0

0

L’

M’

R’*

2nd

byte......

H7

H6

H5

H4

H3

H2

H1

H0

3rd

byte......

V7

V6

V5

V4

V3

V2

V1

V0

4th

byte......

H7

H6

H5

H4

H3

H2

H1

H0

5th

byte......

V7

V6

V5

V4

V3

V2

V1

V0

* ‘ denotes complement