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VV5300 Datasheet(PDF) 37 Page - List of Unclassifed Manufacturers |
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VV5300 Datasheet(HTML) 37 Page - List of Unclassifed Manufacturers |
37 / 43 page cd34011-b.fm 17/10/97 37 VV5300 Sensor No data write followed by same location read. 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. In this example, the gain value (index = 3610) is read as 1510: As mentioned in the previous example, the read message is terminated with a negative acknowledge (A) from the master. Same location multiple data write. 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 setup1 register and initially turns ABC off. The next two data bytes then turn ABC on and then finally off again, leaving it in the default state. Same location multiple data read When an exposure related value ( coarse, fine, acc or gain) 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 status0 register 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 fine 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. S A Sr A A A P 3210 3610 3310 3610 1510 A 0 0 No data write Read index and data S A 010 A A A 2016 210 12810 010 A 0 Write setup1 Turn off ABC Toggle “Force Black Cal.”. P |
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