MT9V112 Datasheet, PDF (28/58 Pages) Micron Technology – SOC VGA DIGITAL IMAGE SENSOR

PRELIMINARY
MT9V112
SOC VGA DIGITAL IMAGE SENSOR
Table 10: Camera Control Register Description
R38:2—0x226 – Auto Exposure Horizontal Window 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 Vertical Window 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 Horizontal Center Window 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 back light 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 Vertical Center Window 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 back light 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.
09005aef8154a39d/09005aef8175e6cc
MT9V112_2.fm- Rev. A 1/05 EN
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