EM84510

PS/2 SCROLLING MOUSE CONTROLLER

8

* This specification are subject to be changed without notice.

5.30.2001

Microsoft PS/2 scrolling mouse mode:

(A) Entering procedure: Except in WRAP mode, while EM84510 received the following consecutive

command.

i. F3 C8

---- set sampling rate 200/sec

ii. F3 64

---- set sampling rate 100/sec

iii. F3 50

---- set sampling rate 80/sec

(B) Operating:

a. All of the commands in legacy mode still be valid.

b. The ID code of read device type command (F2) will changed from "00" to be "03".

c. Data report will be four bytes format:

Byte

Bit

Description

1

0

Left button status; 1 = pressed

1

Right button status; 1 = pressed

2

Middle button status; 1 = pressed

3

Reserve

4

X data sign; 1 = negative

5

Y data sign; 1 = negative

6

X data overflow; 1 = overflow

7

Y data overflow; 1 = overflow

2

0-7

X data ( D0 - D7 )

3

0-7

Y data ( D0 - D7 )

4

0-7

Z data ( D0 - D7 )

(C) Exiting Microsoft scrolling mode:

There are two ways to exit:

a. Power off.

b. Reset command (FF).

Z-axis Input Function : The Z0-Z7 limit value is

±7

(a) Photo couples input : Z-axis counter accumulates the Z1, Z2 phase changed by movement. This mode

includes noise immunity.

Z/1 : 1 dot per count.

Z/4 : 4 dots per count. Counted by Z1=1, Z2=1 phase, the wheel should stay at Z1=0, Z2=0 phase.

(b) Key-switches input : Pressing Z1, Z2 will start to fill the Z-axis counter with the value beginning at one.

Toggling "M" key can increase the value any time by one. The limit value is

±7.

The relationship between the value and the transmission rate as follows :