mt9v112 Micron Semiconductor Products, mt9v112 Datasheet - Page 29

• Manufacturer Part Number: mt9v112
• Description: 1/6-inch Soc Vga Cmos Digital Image Sensor
• Manufacturer: Micron Semiconductor Products

T able 10: Camera Control Register Description (continued)
09005aef8154a39d/09005aef8175e6cc
MT9V112_2.fm- Rev. A 1/05 EN
Bits 7:0
R47:2—0x22F – Auto Exposure Speed and Sensitivity Control—Context A (R/W)
Default
Description
Bit 15
Bit 14
Bits 13:12
Bit 11
Bit 10
Bit 9
Bits 8:6
Bit 5
Bits 4:3
Bits 2:0
R91:2—0x25B - Flicker Control (R/W)
Default
Description
Bit 15
Bit 2
Bit 1
Bit 0
R98:2—0x262 – Auto Exposure Digital Gains Monitor (R/W*)
Default
Description
Bits 15:8
Bits 7:0
Luma value of the auto exposure target.
0xDF20
This register specifies the speed and sensitivity to changes of auto exposure in context A.
Reserved.
Reserved.
Reserved.
Reserved.
Reserved.
Reserved.
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”
“001”
“010”
“011”
“100”
“101”
“110”
“111”
Reserved
Auto exposure luma is updated every N frames, where N is given by this field.
Hysteresis control via time-averaged smoothing of luma data. Luma measurements for auto exposure are
time-averaged as follows:
“000”
“001”
“010”
“011”
“100”
“101”
“110”
“111”
0x0002
Primary Flicker Control Register.
(READ only) 50Hz/60Hz detected.
0: 50Hz detected.
1: 60Hz detected.
Reserved.
When in “manual” flicker mode (R91:2[0] = 1), defines which flicker frequency to avoid.
0: Forces 50Hz detection.
1: Forces 60Hz detection.
0: Auto flicker detection.
1: Manual Mode.
These digital gains are applied within the IFP; they are independent of the imager gains.
Post-lens correction digital gain (writable if auto exposure is disabled).
Pre-lens correction digital gain (writable if auto exposure is disabled).
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1/4 way going down, 1/8 going up.
1/4 way in both directions.
1/2 way in both directions.
1/2 way going down, 1/4 going up.
All the way in both directions (fast adaptation!).
3/4 way in both directions.
7/8 way in both directions.
Reserved. Currently the same as “100”
Auto exposure luma = current luma.
Auto exposure luma = 1/2 current luma + 1/2 buffered value.
Auto exposure luma = 1/4 current luma + 3/4 buffered value.
Auto exposure luma = 1/8 current luma + 7/8 buffered value.
Auto exposure luma = 1/16 current luma + 15/16 buffered value.
Auto exposure luma = 1/32 current luma + 31/32 buffered value.
Auto exposure luma = 1/64 current luma + 63/64 buffered value.
Auto exposure luma = 1/128 current luma + 127/128 buffered value.
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SOC VGA DIGITAL IMAGE SENSOR
Micron Technology, Inc., reserves the right to change products or specificat ions wit hout not ice.
©2004 Micron Technology, Inc. All rights reserved.
PRELIMINARY
MT9V112