PixArt Imaging Inc.

PAW3101DB

CMOS Optical Mouse Sensor

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7

PixArt Imaging Inc.

V3.1 May. 2008

0x16

Motion_Status

Bit

7

6

5

4

3

2

1

0

Field

Motion

Reserved[3:2]

DYOVF

DXOVF

Reserved[1:0]

RES

Usage

Register 0x16 allows the user to determine if motion has occurred since the last time it was read. If

so, then the user should read registers 0x17 and 0x18 to get the accumulated motion. It also tells if the

motion buffers have overflowed since the last reading. The current resolution is also shown.

Reading this register freezes the Delta_X and Delta_Y register values. Read this register before

reading the Delta_X and Delta_Y registers. If Delta_X and Delta_Y are not read before the motion

register is read a second time, the data in Delta_X and Delta_Y will be lost.

Field Name

Description

Motion

Motion since last report or PD

0 = No motion (Default)

1 = Motion occurred, data ready for reading in Delta_X and Delta_Y registers

Reserved[3:2]

Reserved for future use

DYOVF

Motion Delta Y overflow, ΔY buffer has overflowed since last report

0 = No overflow (Default)

1 = Overflow has occurred

DXOVF

Motion Delta X overflow, ΔX buffer has overflowed since last report

0 = No overflow (Default)

1 = Overflow has occurred

Reserved[1:0]

Reserved for future use

Notes

RES

Resolution in counts per inch

0 = 800 (Default)

1 = 400

0x17

Delta_X

Bit

7

6

5

4

3

2

1

0

Field

X7

X6

X5

X4

X3

X2

X1

X0

Usage

X movement is counts since last report. Absolute value is determined by resolution. Reading clears

the register. Report range –128 ~ +127.

0x18

Delta_Y

Bit

7

6

5

4

3

2

1

0

Field

Y7

Y6

Y5

Y4

Y3

Y2

Y1

Y0

Usage

Y movement is counts since last report. Absolute value is determined by resolution. Reading clears

the register. Report range –128 ~ +127.