MT9M111 View Datasheet(PDF) - Micron Technology
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PRELIMINARY
MT9M111
SOC MEGAPIXEL DIGITAL IMAGE SENSOR
Table 10: Camera Control Register Description
R38:2—0X226 - AUTO EXPOSURE WINDOW HORIZONTAL BOUNDARIES (R/W)
Default 0x8000
Description This register specifies the left and right boundaries of the window used by the auto exposure measurement
engine. The values programmed in the registers are the fractional percentage, where 128 (decimal) is the
right-most edge of the frame, 64 (decimal) is the middle of the frame, and 0 is the left-most edge of the frame.
Bits 15:8 Right window boundary.
Bits 7:0 Left window boundary.
R39:2—0X227 - AUTO EXPOSURE WINDOW VERTICAL BOUNDARIES (R/W)
Default 0x8008
Description This register specifies the top and bottom boundaries of the window used by the auto exposure measurement
engine. The values programmed in the registers are the fractional percentage, where 128 (decimal) is the
bottom edge of the frame, 64 (decimal) is the middle of the frame, and 0 is the top edge of the frame.
Bits 15:8 Bottom window boundary.
Bits 7:0 Top window boundary.
R43:2—0X22B - AUTO EXPOSURE CENTER WINDOW HORIZONTAL BOUNDARIES (R/W)
Default 0x6020
Description This register specifies the left and right boundaries of the window used by the auto exposure measurement
engine in backlight compensation mode. The values programmed in the registers are the fractional
percentage, where 128 (decimal) is the right-most edge of the frame, 64 (decimal) is the middle of the frame,
and 0 is the left-most edge of the frame.
Bits 15:8 Right window boundary.
Bits 7:0 Left window boundary.
R44:2—0X22C - AUTO EXPOSURE CENTER WINDOW VERTICAL BOUNDARIES (R/W)
Default 0x6020
Description This register specifies the top and bottom boundaries of the window used by the auto exposure measurement
engine in backlight compensation mode. The values programmed in the registers are the fractional
percentage, where 128 (decimal) is the bottom edge of the frame, 64 (decimal) is the middle of the frame, and
“0” is the top edge of the frame.
Bits 15:8 Bottom window boundary.
Bits 7:0 Top window boundary.
R45:2—0X22D - AWB WINDOW BOUNDARIES (R/W)
Default 0xF0A0
Description This register specifies the boundaries of the window used by the AWB measurement engine. Essentially, it
describes the AWB measurement window in terms relative to the size of the image—horizontally, in units of
1/10ths of the width of the image; vertically, in units of 1/16 of the height of the image. So although the
positioning is highly quantized, the window remains roughly in place as the resolution changes.
Bits 15:12 Bottom window boundary (in units of blocks).
Bits 11:8 Top window boundary (in units of blocks).
Bits 7:4 Right window boundary (in units of 2 blocks).
Bits 3:0 Left window boundary (in units of 2 blocks).
R46:2—0X22E - AUTO EXPOSURE TARGET AND PRECISION CONTROL (R/W)
Default 0x0C4A
Description This register specifies the luma target of the auto exposure algorithm and the size of the window/range
around the target in which no auto exposure adjustment is made. This window is centered on target, but the
value programmed in the register is 1/2 of the window size.
Bits 15:8 Half-size of the auto exposure stability window/range.
Bits 7:0 Luma value of the auto exposure target.
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MT9M111__SOC1310__2.fm - Rev. C 10/04 EN
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Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology, Inc. All rights reserved.
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