PixArt Imaging Inc.
PAN301A
0x02
Bit
Field
Usage
7
Motion
6
5
Reserved[6:5]
Motion_Status
4
DYOVF
3
DXOVF
2
RES[2:1]
1
0
Reserved
CMOS Optical Mouse Sensor
Register 0x02 allows the user to determine if motion has occurred since the last time it was read. If
so, then the user should read registers 0x03 and 0x04 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.
Notes
Field Name
Description
Motion since last report or PD
0 = No motion (Default)
1 = Motion occurred, data ready for reading in Delta_X and Delta_Y registers
Motion
Reserved[6:5]
DYOVF
Reserved for future
Motion Delta Y overflow,
∆Y
buffer has overflowed since last report
0 = No overflow (Default)
1 = Overflow has occurred
Motion Delta X overflow,
∆X
buffer has overflowed since last report
DXOVF
0 = No overflow (Default)
1 = Overflow has occurred
Resolution in counts per inch
0 = 800 (Default @ PAN301ASI-208)
1 = 400 (Default @ PAN301ASI-204)
2 = 600
RES[2:1]
Reserved
0x03
Bit
Field
Usage
0x04
Bit
Field
Usage
7
Y7
7
X7
Reserved for future
Delta_X
6
X6
5
X5
4
X4
3
X3
2
X2
1
X1
0
X0
X movement is counts since last report. Absolute value is determined by resolution. Reading clears
the register. Report range –128~+127.
Delta_Y
6
Y6
5
Y5
4
Y4
3
Y3
2
Y2
1
Y1
0
Y0
Y movement is counts since last report. Absolute value is determined by resolution. Reading clears
the register. Report range –128~+127.
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.
5
V1.3, MAY. 2004
PixArt Imaging Inc.
E-mail:
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PIXART [ PIXART IMAGING INC. ]
