OV8610/OV8110
SINGLE IC CMOS VGA DIGITAL CAMERAS
OmniVision Technologies, Inc. 930 Thompson Place Sunnyvale, CA 94085 U.S.A.
Tel: (408) 733-3030 Fax: (408) 733-3061
e-mail: info@ovt.com
Website: http://www.ovt.com
Version 1.3, August 27, 2001
Page 21
Sub-
address
(hex)
Register
Default
(hex)
Read/
Write
Descriptions
22
UOFF
80
RW
U Channel offset adjustment
UOFF[7] – Offset adjustment direction: 0 - Add U[6:0]; 1 - Subtract U[6:0].
UOFF[6:0] – U channel digital output offset adjustment. Range: +128 ~ -128. If
COMG[2]=0, this register will be updated by internal circuit. Write a value to
this register through SCCB has no effect. COMG[2]=1, U channel offset
adjustment will use the stored value which can be changed through SCCB.
This register has no effect to ADC output data if COMF[1]=1. If output RGB
raw data, this register will adjust B channel data.
Note: This function is not available on the OV8110 image sensor.
23
CLKC
04
RW
Oscillator circuit and common mode control
CLKC[7:6] – Select different crystal circuit power level (“11” = minimum).
CLKC[5] – ADC current control, “1” – half current, “0” full current.
CLKC[4] – Output data polarity selection. “1” – negative, “0” – positive.
CLKC[3] – Horizontal array skip mode. “1” – only read out half of horizontal
pixel (400) and frame rate will double. “0” – full pixel read out
CLKC[2] – Vertical array 1
st stage skip mode. “1” – only read out half of vertical
lines (200) and frame rate will double.
CLKC[1] – System clock output selection. “1” half frequency of system clock, “0”
– system clock. Only effective when FODD is set to output system clock.
CLKC[0] – Aperture correction mode selection. “1” enable threshold relative to
current gain faction. “0” – disable this function.
24
AEW
33
RW
Automatic exposure control: Bright pixel ratio adjustment
AEW[7:0] – Used as calculate bright pixel ratio. OV8610/OV8110 AEC
algorithm is count whole field bright pixel (its luminance level is higher than a
fixed level) and black pixel (its luminance level is lower than a fixed level)
number. When bright/black pixel ratio is on the range of the ratio defined by
the register [24] and [25], image stable. This register is used to define bright
pixel ratio, default is 25%, each LSB represent step: 1.3% for interlace and
0.7% for progressive scan. Change range is: [01] ~ [65]; Increase AEW[7:0]
will increase bright pixel ratio. For same light condition, the image brightness
will increase if AEW[7:0] increase.
Note: AEW[7:0] must combine with register [25] AEB[7:0]. The relation must be as
follows: AEW[7:0] + AEB[7:0] > [65].
25
AEB
97
RW
Automatic Exposure Control: Black pixel ratio adjustment
AEB[7:0] – used as calculate black pixel ratio. OV8610/OV8110 AEC algorithm
is count whole field/ frame bright pixel (its luminance level is higher than a
fixed level) and black pixel (its luminance level is lower than a fixed level)
number. When bright/black pixel ratio is in the range of the ratio defined by
the register [24] and [25], image stable. This register is used to define black
pixel ratio, default is 75%, each LSB represent step: 1.3% for interlace and
0.7 for progressive scan. Change range is: [01] ~ [65]; Increase AEB[7:0] will
increase black pixel ratio. For same light condition, the image brightness will
decrease if AEB[7:0] increase.
Note: AEB[7:0] must e combined with register [24] AEW[7:0]. The relation must be
as follows: AEW[7:0] + AEB[7:0] > [65].
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