UTC UT84520

CMOS IC

QW-R502-004,A

Byte

Bit

Description

1

0

1 = Right button pressed

1

1 = Middle button pressed

2

1 = Left button pressed

3

Reserved

4

0 = Normal speed, 1 = Autospeed

5

0 = Disabled, 1 = Enabled

6

0 = Stream mode, 1 = Remote mode

7

Reserved

2

0-7

Current resolution setting (D0 – D7)

3

0-7

Current sampling rate (D0 – D7)

n). Set Resolution (E8,XX)

UT84520 provides four resolutions selected by the second byte of this command as following:

Second Byte XX

Resolution

00

8 dots/count

01

4 dots/count

02

2 dots/count

03

1 dots/count

o). Set Autospeed (E7)

At the end of a sample interval in the stram mode, the current X and Y data values are converted new values.

The sign bits are not involved in this conversion. The conversion is only in stream mode. The relationship

between the input and output count is as following:

Input

Output

0

0

1

1

2

1

3

3

4

6

5

9

N ≧ 6

2 * N

p). Reset Autospeed (E6)

This command restore normal speed

(III). Microsoft PS/2 scrolling mouse mode:

(A)Entering procedure: Except in Wrap mode, while UT84520 received the following consecutive command:

i. F3 C8 for set sampling rate 200/sec

ii. F3 64 for set sampling rate 100/sec

iii F3 50 for set sampling rate 80/sec