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MT9V112 Datasheet(PDF) 30 Page - Micron Technology |
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MT9V112 Datasheet(HTML) 30 Page - Micron Technology |
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30 / 58 page  MT9V112 SOC VGA DIGITAL IMAGE SENSOR PRELIMINARY 09005aef8154a39d/09005aef8175e6cc Micron Technology, Inc., reserves the right to change products or specifications without notice. MT9V112_2.fm- Rev. A 1/05 EN 30 ©2004 Micron Technology, Inc. All rights reserved. R103:2—0x267 – Auto Exposure Digital Gain Limits (R/W) Default 0x4010 Description This register specifies the upper limits of the digital gains used by the auto exposure algorithm. The values programmed to this register are 16 times the absolute gain values. The value of 16 represents the gain 1.0. Bits 15:8 Maximum limit on post-lens correction digital gain. Bits 7:0 Maximum limit on pre-lens correction digital gain. R156:2—0x29C – Auto Exposure Speed and Sensitivity Control—Context B (R/W) Default 0xDF20 Description This register specifies the speed and sensitivity to auto exposure changes in context B. Bit 15 Reserved. Bit 14 Reserved. Bits 13:12 Reserved. Bit 11 Reserved. Bit 10 Reserved. Bit 9 Reserved. Bits 8:6 Factor of reduction of the difference between current luma and target luma. In one adjustment, auto exposure advances from current luma to target as follows: “000” —1/4 way going down, 1/8 going up. “001” —1/4 way in both directions. “010” —1/2 way in both directions. “011” —1/2 way going down, 1/4 going up. “100” —All the way in both directions (fast adaptation!). “101” —3/4 way in both directions. “110” —7/8 way in both directions. “111” —Reserved. Currently the same as “100.” Bit 5 Reserved. Bits 4:3 Auto exposure luma is updated every N frames, where N is given by this field. Bits 2:0 Hysteresis control via time-averaged smoothing of luma data. Luma measurements for auto exposure are time-averaged as follows: “000” —Auto exposure luma = current luma. “001” —Auto exposure luma = 1/2 current luma + 1/2 buffered value. “010” —Auto exposure luma = 1/4 current luma + 3/4 buffered value. “011” —Auto exposure luma = 1/8 current luma + 7/8 buffered value. “100” —Auto exposure luma = 1/16 current luma + 15/16 buffered value. “101” —Auto exposure luma = 1/32 current luma + 31/32 buffered value. “110” —Auto exposure luma = 1/64 current luma + 63/64 buffered value. “111” —Auto exposure luma = 1/128 current luma + 127/128 buffered value. R180:2 – Reserved R200:2—0x2C8 – Global Context Control (R/W) Default 0x0000 Description Defines sensor and colorpipe context for current frame. Context A is typically used to define preview or viewfinder mode, while context B is typically used for snapshots. The bits of this register directly control the respective functions, so care must be taken when writing to this register if a bad frame is to be avoided during the context switch. Bit 15 Controls assertion of sensor restart on update of global context control register. This helps ensure that the very next frame is generated with the new context (a problem with regard to exposure due to the rolling shutter). This bit is automatically cleared once the restart has occurred. 0: Do not restart sensor. 1: Restart sensor. Table 10: Camera Control Register Description (continued) |
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