EM83702B Ver la hoja de datos (PDF) - ELAN Microelectronics

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EM83702B

ALL IN ONE MOUSE CONTROLLER

ELAN Microelectronics 

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 no ...... 6 5 4 3 2 1 0

1st byte...... 1 L R V7' V6' H7 H6

2nd byte...... 0 H5 H4 H3 H2 H1 H0

3rd byte...... 0 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

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