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MT9M131 Datasheet(PDF) 23 Page - ON Semiconductor

No. de pieza MT9M131
Descripción Electrónicos  1/3?릋nch SOC 1.3Mp CMOS Digital Image Sensor
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
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MT9M131 Datasheet(HTML) 23 Page - ON Semiconductor

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CAMERA CONTROL REGISTERS
Register WRITEs reach the camera control registers
immediately. For non-AE/AWB/CCM registers, register
writes take effect immediately.
For AE/AWB and CCM registers, the effects of register
writes are dependent on the state of the AE and AWB
engines. It may take from zero to many frames for the
changes to take effect. Monitor AWB/CCM changes by
watching for stable settings in R0x212 (current CCM
position), in R0x213 (current AWB red channel), and in
R0x214 (current AWB blue channel). Monitor AE changes
by watching register R0x24C (AE current luma exposure),
and register R0x262 (AE digital gains monitor).
Table 11. CAMERA CONTROL REGISTER DESCRIPTION
Register Number
Dec − Hex
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 AE 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 AE 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 AE 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 AE 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 1 block)
Bits 11:8
Top window boundary (in units of 1 block)
Bits 7:4
Right window boundary (in units of 2 blocks)
Bits 3:0
Left window boundary (in units of 2 blocks)


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