參數(shù)資料
型號(hào): VV5430
廠商: Electronic Theatre Controls, Inc.
英文描述: Integrated CMOS Image Sensor with support for ADC and external control via serial interface
中文描述: 集成CMOS ADC和與外部控制支持通過串行接口圖像傳感器
文件頁數(shù): 23/32頁
文件大?。?/td> 288K
代理商: VV5430
09/04/97
23
Write to Camera
WRITE TO CAMERA
Information to be communicated from host to camera consists of configuration data (for example
automatic gain control ON), and parametric information (for example sensor integration time). The
write data is formed into two bytes. A 4-bit Header Code in the first byte is used by the camera to
determine the destination of the 12-bit message following the header.
Receive Data Format
After the camera acknowledges the receipt of a valid address the host transfers the first data byte
which the camera acknowledges by pulling SDA low. The second byte is then sent followed by a
final acknowledge from the camera. A stop condition is produced by the host after the second
message byte. As with the read procedure, the stop condition is not absolutely necessary as the
camera’s serial interface will reset automatically after two bytes have been received.
The valid Header Codes and their data structures are fully described in the following pages.
Timing Protocol
When an exposure or gain value has been written to the camera it is held in the interface until the
camera is ready to consume the new data. For correct operation, there should be no further read
or write accesses to the camera during this hold period. Normal communication between other
modules connected to the serial interface will not cause problems. The minimum length of the wait
period is
40ms
in EIA mode and
34ms
in CCIR mode from the end of the data transfer.
S
ADDRESS[7:1]
R
/
W
A
DATA[11:8]
DATA[7:0]
A
A
P
Write = 0
Camera acknowledge (valid address)
Camera acknowledge
HEADER
0 0 1 0 0 x x 0
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