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MT9M131 Fiches technique(PDF) 23 Page - ON Semiconductor |
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MT9M131 Fiches technique(HTML) 23 Page - ON Semiconductor |
23 / 50 page MT9M131 www.onsemi.com 23 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) |
Numéro de pièce similaire - MT9M131_17 |
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