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參數(shù)資料
| 型號： | VV5410 |
| 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)： | 83/105頁 |
| 文件大小： | 489K |
| 代理商： | VV5410 |
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CMOS Sensor; Customer Datasheet, Rev 3.0, 28 September 2000
VV5410 & VV6410
Commercial in confidence
cd5410-6410f-3-0.fm
9.6.3
When a location is to be read, but the value of the stored index is not known, a write message with no data byte must be written
first, specifying the index. The read message then completes the message sequence. To avoid relinquishing the serial to bus to
another master a repeated start condition is asserted between the write and read messages, i.e. no stop condition is asserted. In
this example, the gainvalue (index = 36
10
) is read as 15
10
:
No data write followed by same location read.
As mentioned in the previous example, the read message is terminated with a negative acknowledge (A) from the master.
9.6.4
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. auto-load)
must be toggled.
Same location multiple data write.
The message sequence indexes sf_setupregister 108. If bit 0 is toggled high, low this will initiate a fresh auto-load. This is
achieved by writing two consecutive data bytes to the sensor. There is no requirement to re-send the register index before each
data byte.
9.6.5
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.
Same location multiple data read
In the below 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.
Figure 40 : No data write followed by same location read.
S
A
Sr
A
A
A
33
10
36
10
33
10
36
10
15
10
A
0
0
No data write
Read index and data
S
A
A
A
32
10
21
10
4
10
0
10
A
0
Write to pin_mapping
Figure 41 : Same location multiple data write.
4
10
P
Toggle control bit
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| VV5F3-30-041 | 制造商:SMC Corporation of America 功能描述:Manifold Base for VF series, base mt, 1/4 inch |
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