PixArt Imaging Inc.
Low Power LED Integrated Slim Mouse Sensor
Revision_ID
Address: 0x01
Reset Value: 0x02
Bit
Field RID
Access: Read
7
6
5
4
3
2
1
0
RID
RID
RID
RID
RID
RID
RID
0
7
6
5
4
3
2
1
Data Type:
USAGE:
8-bit unsigned integer
This register contains the IC revision. It is subject to change when new IC versions are released.
Motion
Address: 0x02
Reset Value: 0x00
Access: Read/Write
7
6
5
4
3
2
1
0
Bit
MOT
PIXRDY
PIXFIRST
OVF
Reserved Reserved
Reserved
Reserved
Field
Data Type:
USAGE:
bit field
Register 0x02 allows the user to determine if motion has occurred since the last time it was read. If the
MOT bit is set, then the user should read registers 0x03 and 0x04 to get the accumulated motion. Read
this register before reading the Delta_Y and Delta_X registers.
Writing anything to this register clears the MOT and OVF bits, Delta_Y and Delta_X registers. The
written data byte is not saved.
Internal buffers can accumulate more than eight bits of motion for X or Y. If either one of the internal
buffers overflows, then absolute path data is lost and the OVF bit is set. This bit is cleared once some
motion has been read from the Delta_X and Delta_Y registers, and if the buffers are not at full scale.
Since more data is present in the buffers, the cycle of reading the Motion, Delta_X and Delta_Y regis-
ters should be repeated until the motion bit (MOT) is cleared. Until MOT is cleared, either the Delta_X
or Delta_Y registers will read either positive or negative full scale. If the motion register has not been
read for long time, at 500 cpi it may take up to 16 read cycles to clear the buffers, at 1000 cpi, up to 32
cycles. To clear an overflow, write anything to this register.
The PIXRDY bit will be set whenever a valid pixel data byte is available in the Pixel_Dump register.
Check that this bit is set before reading from Pixel_Dump. To ensure that the Pixel_Grab pointer has
been reset to pixel 0,0 on the initial write to Pixel_Grab, check to see if PIXFIRST is set to high.
Field Name
Description
MOT
Motion since last report
0 = No motion
1 = Motion occurred, data ready for reading in Delta_X and Delta_Y registers
PIXRDY
Pixel Dump data byte is available in Pixel_Dump register
0 = data not available
1 = data available
PIXFIRST
This bit is set when the Pixel_Grab register is written to or when the complete
pixel array has been read, initiating an increment to pixel 0,0.
0 = Pixel_Grab data not from pixel 0,0
1 = Pixel_Grab data is from pixel 0,0
OVF
Motion overflow, _Y and/or _X buffer has overflowed since last report
0 = no overflow
1 = Overflow has occurred
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
17
PIXART [ PIXART IMAGING INC. ]
