adns-7700 Avago Technologies, adns-7700 Datasheet - Page 44

• Manufacturer Part Number: adns-7700
• Description: One Chip Usb Laserstream? Mouse Sensors
• Manufacturer: Avago Technologies

PIX_GRABBER
Access: Read/Write
Data Type: 8-bit number.
USAGE: The pixel grabber captures 1 pixel per frame. If there is a valid pixel in the grabber when this is read, the MSB will
Figure 27. Directions are for a complete mouse, with the ADNS-6180-001 or ADNS-6180-002 lens
44
Bit
Field
be set, an internal counter will incremented to captured the next pixel and the grabber will be armed to capture
the next pixel. It will take 576 reads to upload the completed image. For each pixel read, the register should be
polled (continuously read) until VALID = 1 before the PG [6:0] is taken as valid pixel data. Any write to this register
will reset and arm the grabber to grab pixel 0 on the next image.
The X and Y directions with respect to the mouse case are shown in Figure 27.See pixel array numbering in
Figure 28 that shows the readout order of the array. Rows are read from bottom to top and columns are from
left to right.
P
O
V
S
T
E
Y
I
I
7
VALID
Top Xray View of Mouse
LB
1
2
3
4
5
6
7
8
9
10
11
POSITIVE X
6
PG
6
22
21
20
19
18
17
16
15
14
13
12
RB
Address: 0x0E
Reset Value: 0x00
5
PG
5
4
PG
4
3
PG
3
2
PG
2
Type: Device
1
PG
1
0
PG
0