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MT9P031 データシート(PDF) 18 Page - ON Semiconductor |
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MT9P031 データシート(HTML) 18 Page - ON Semiconductor |
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18 / 32 page  MT9P031 www.onsemi.com 18 If row binning is combined with row mirroring, the binning is still done in the positive direction. Therefore, if the first output row in bin 2X + row mirror was 1997, pixels on rows 1997 and 1999 would be averaged together. The next pixel output would be from rows 1996 and 1998, followed by the average of 1993 and 1995. For column mirroring plus binning, the span of pixels used should be the same as with non-mirror mode. Maintaining a Constant Frame Rate Maintaining a constant frame rate while continuing to have the ability to adjust certain parameters is the desired scenario. This is not always possible, however, because register updates are synchronized to the read pointer, and the shutter pointer for a frame is usually active during the readout of the previous frame. Therefore, any register changes that could affect the row time or the set of rows sampled causes the shutter pointer to start over at the beginning of the next frame. By default, the following register fields cause a “bubble” in the output rate (that is, the vertical blank increases for one frame) if they are written in continuous mode, even if the new value would not change the resulting frame rate: • Row_Start • Row_Size • Column_Size • Horizontal_Blank • Vertical_Blank • Shutter_Delay • Mirror_Row • Row_Bin • Row_Skip • Column_Skip The size of this bubble is (SW × tROW), calculating the row time according to the new settings. The Shutter_Width_Lower and Shutter_Width_Upper fields may be written without causing a bubble in the output rate under certain circumstances. Because the shutter sequence for the next frame often is active during the output of the current frame, this would not be possible without special provisions in the hardware. Writes to these registers take effect two frames after the frame they are written, which allows the shutter width to increase without interrupting the output or producing a corrupt frame (as long as the change in shutter width does not affect the frame time). Synchronizing Register Writes to Frame Boundaries Changes to most register fields that affect the size or brightness of an image take effect on the frame after the one during which they are written. These fields are noted as “synchronized to frame boundaries” in Table 12 of the register reference. To ensure that a register update takes effect on the next frame, the write operation must be completed after the leading edge of FV and before the trailing edge of FV. As a special case, in Snapshot modes (see “Operating Modes”), register writes that occur after FV but before the next trigger will take effect immediately on the next frame, as if there had been a Restart. However, if the trigger for the next frame in ERS Snapshot mode occurs during FV, register writes take effect as with continuous mode. Additional control over the timing of register updates can be achieved by using synchronize_changes. If this bit is set, writes to certain register fields that affect the brightness of the output image do not take effect immediately. Instead, the new value is remembered internally. When synchronize_changes is cleared, all the updates simultaneously take effect on the next frame (as if they had all been written the instant synchronize_changes was cleared). Register fields affected by this bit are identified in Table 13 of the register reference. Fields not identified as being frame−synchronized or affected by synchronize_changes are updated immediately after the register write is completed. The effect of these registers on the next frame can be difficult to predict if they affect the shutter pointer. Restart To restart the MT9P031 at any time during the operation of the sensor, write a “1” to the restart register (R0x0B[0] = 1). This has two effects: first, the current frame is interrupted immediately. Second, any writes to frame-synchronized registers and the shutter width registers take effect immediately, and a new frame starts (in continuous mode). Register updates being held by synchronize_changes do not take effect until that bit is cleared. The current row and one following row complete before the new frame is started, so the time between issuing the Restart and the beginning of the next frame can vary by about tROW. If Pause_Restart is set, rather than immediately beginning the next frame after a restart in continuous mode, the sensor pauses at the beginning of the next frame until Pause_Restart is cleared. This can be used to achieve a deterministic time period from clearing the Pause_Restart bit to the beginning of the first frame, meaning that the controller does not need to be tightly synchronized to LV or FV. NOTE: When Pause_Restart is cleared, be sure to leave Restart set to “1” for proper operation. The Restart bit will be cleared automatically by the device. Image Acquisition Modes The MT9P031 supports two image acquisition modes (Shutter Types) (see “Operating Modes”), electronic rolling shutter and global reset release. Electronic Rolling Shutter The ERS modes take pictures by scanning the rows of the sensor twice in the order described in “Full-Array Readout”. On the first scan, each row is released from reset, starting the exposure. On the second scan, the row is sampled, processed, and returned to the reset state. The exposure for |
同様の部品番号 - MT9P031_17 |
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同様の説明 - MT9P031_17 |
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