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參數(shù)資料
| 型號： | ADNS-3060 |
| 英文描述： | High-performance Optical Mouse Sensor |
| 中文描述： | 高性能的光學(xué)鼠標(biāo)傳感器 |
| 文件頁數(shù)： | 19/38頁 |
| 文件大?。?/td> | 530K |
| 代理商： | ADNS-3060 |
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19
Frame Capture
This is a fast way to download
a full array of pixel values
from a single frame. This
mode disables navigation and
overwrites any downloaded
firmware. A hardware reset is
required to restore navigation,
and the firmware must be
reloaded afterwards if
required.
To trigger the capture, write to
the Frame_Capture register.
The next available complete 1
2/3 frames (1536 values) will
be stored to memory. The data
are is retrieved by reading the
Pixel_Burst register once using
the normal read method, after
which the remaining bytes are
clocked out by driving SCLK at
the normal rate. The byte time
must be at least t
LOAD
. If the
Pixel_ Burst register is read
before the data is ready, it will
return all zeros.
To read a single frame, read a
total of 900 bytes. The next
636 bytes will be
approximately 2/3 of the next
frame. The first pixel of the
first frame (1st read) has bit 6
set to 1 as a start-of-frame
marker. The first pixel of the
second partial frame (901st
read) will also have bit 6 set
to 1. All other bytes have bit 6
set to zero. The MSB of all
bytes is set to 1. If the
Pixel_Burst register is read
past the end of the data (1537
reads and on) , the data
returned will be zeros.
After the download is
complete, the micro-controller
must raise the NCS line for at
least t
BEXIT
to terminate burst
mode. The read may be
aborted at any time by raising
NCS.
Alternatively, the frame data
can also be read one byte at a
time from the Frame_Capture
register. See the register
description for more
information.
Figure 24. Frame capture burst mode timing
NCS
address
data
address
address
MOSI
SCLK
P0
P1
P899
MISO
t
NCS-SCLK
>120ns
frame capture reg write
enter burst
mode
t
CAPTURE
t
≥
10
μ
s
Notes:
1. MSB = 1 for all bytes. Bit 6 = 0 for all bytes except pixel 0 of both frames which has bit 6 = 1 for use as a frame marker.
2. Reading beyond pixel 899 will return the first pixel of the second partial frame.
3. t
CAPTURE
= 10
μ
s + 3 frame periods.
4. This figure illustrates reading a single complete frame of 900 pixels. An additional 636 pixels from the next frame are available.
t
≥
10
μ
s
t
SRAD
pixel dump reg read
P0 bit 6 set to 1
all MSB = 1
see note 2
soonest to begin again
frame capture reg
exit burst mode
t
BEXIT
≥
50
μ
s
≥
4
μ
s
≥
10
μ
s
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|---|---|
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