EM83702
ALL IN ONE MOUSE CONTROLLER
(B) Microsoft mode
In microsoft mode, the transmission cycle consists of three bytes. Each byte is divided into one start bit, seven
data bits and two stop bit. The first byte contains “L”,”R” switch status and four bits of the two most sig-
nificant bits in horizontal counter and vertical counter. The next byte represents the value accumulated by
horizontal counter, the last byte is the data of the vertical counter. Notice that “M” key-switch is not active
in the microsoft mode and the vertical data is transmited in 2’s complement.
Output byte arrange:
bit
1st
no ......
byte......
6
1
0
0
5
L
4
R
3
2
1
0
V7' V6' H7 H6
H3 H2 H1 H0
2nd byte......
3rd byte......
H5 H4
V5' V4' V3' V2' V1' V0'
(C) Testing mode
Whenever OPT is connected to VDD, the chip will enter buyer’s testing mode. The X direction output signals
of comparators will present to L and M pin. Pressing “R” key can toggle the output from X direction to Y
direction.
(D) Echo mode
RXD will send out CD(H) code when RTS rise from low to high under microsoft mode. Under mouse
system mode, when RTS rise from low to high, the RXD pin EM83702 will send out two byte C8(H) code.
* This specification are subject to be changed without notice.
4.15.1996
4
ELAN [ ELAN MICROELECTRONICS CORP ]
