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參數(shù)資料
| 型號： | STV6404E-001 |
| 廠商： | 意法半導體 |
| 英文描述： | Mono and Colour Digital Video CMOS Image Sensors |
| 中文描述： | 莫諾和數(shù)字視頻彩色CMOS圖像傳感器 |
| 文件頁數(shù)： | 39/54頁 |
| 文件大?。?/td> | 786K |
| 代理商： | STV6404E-001 |
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VV5404 & VV6404
CD5404-6404F-A
39/54
As mentioned in the previous example, the read message is terminated with a negative acknowledge (A) from the
master.
5.6.4
It may be desirable to write a succession of data to a common location. This is useful when the status of a bit,(e.g.
requesting a new black calibration), must be toggled.
The message sequence indexes setup1register. If bit 1 is toggled low, high low this will initiate a fresh black
calibration. This is achieved by writing three consecutive data bytes to the sensor. There is no requirement to re-send
the register index before each data byte.
Same location multiple data write.
5.6.5
When an exposure related value (fineH, fineL, coarseH, coarse L gain or clk_div) is written, it takes effect on the
output at the beginning of the next video frame, (remember that the application of the gain value is a frame later than
the other exposure parameters). To signal the consumption of the written value, a flag is set when any of the exposure
or gain registers are written and is reset at the start of the next frame. This flag appears in status0register and may
be monitored by the bus master. To speed up reading from this location, the sensor will repeatedly transmit the current
value of the register, as long as the master acknowledges each byte read.
In the next example, a fineH exposure value of 0 is written, the status register is addressed (no data byte) and then
constantly read until the master terminates the read message.
Same location multiple data read
Figure 21 : No data write followed by same location read.
S
A
Sr
A
A
A
P
32
10
36
10
33
10
36
10
15
10
A
0
0
No data write
Read index and data
S
A
0
10
A
A
A
32
10
17
10
2
10
0
10
A
0
Write setup1
Turn off ABC
Toggle “Force Black Cal.”.
P
Figure 22 : Same location multiple data write.
S
A
0
A
A
A
32
10
33
10
32
10
0
10
A
0
Sr
A
A
A
A
33
10
0
10
1
1
1
A
0
Sr
Write fineL with zero
Address the status0 reg.
A
1
0
A
Read continuously...
...until flag reset
P
Figure 23 : Same location multiple data read.
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