ov7620 OmniVision Technologies, Inc, ov7620 Datasheet - Page 39

• Manufacturer Part Number: ov7620
• Description: Single-chip Cmos Vga Color Digital Camera
• Manufacturer: OmniVision Technologies, Inc

OV7620/OV7120 Product Specifications - Rev. 1.2 (7/10/01)
Register 1E ~ 1F- rw: Reserved
Register 20- rw: Common control E
Register 21- rw: Y Channel Offset Adjustment
Bits
Default
Bits
Default
MIDL<7:0>- read only, always returns “A2”
These two registers are reserved for internal use. Write data to these registers will not function.
COME7 - Modified CCIR656 format vertical sizing enabled. “1” will enable vertical windowing function. “0”
COME6 - Field luminance average signal generation enable.Value is stored in register [7C]
COME5 - “1” First stage aperture correction enable. Correction strength will be decided by register [07]. “0”
COME4 - “1” Second stage aperture correction enable. Correction strength and threshold value will be
COME3 - AWB smart mode enable. 1 - Drop out pixel when compare pixel red, blue and green component
COME2 - Reserved.
COME1 - AWB fast/slow mode selection. “1” - AWB is always fast mode, that is register [01] and [02] is
COME0 - Digital output driver capability increase selection: “1” Double digital output driver current; “0” low
Y
Y7: Offset adjustment direction 0 - Add Y[6:0]; 1 - Subtract Y[6:0].
6-Y0: Y channel digital output offset adjustment. Range: +127mV ~ -127mV. If COMG2=0, this register
COME7
Y7
0
1
will limit vertical size to 480 lines - unchanged by [19] and [1B ].
disable first stage aperture correction.
decided by register 26 bit 7 ~ register 26 bit 4.
level to change register [01] and [02], which luminance level is higher than presetting level and
lower than presetting level, this two level is set by register [0F]. 0 - calculate all pixels to get
AWB result. Valid only when register 13 bit 0=1 and register 12 bit 2=1
changed every field/frame. “0” AWB is slow mode, [01] and [02] change every 16/64 field/
frame decided by register 70 bit 1. When AWB enable, register 12 bit 2=1, AWB is working as
fast mode at first 1024 field/frame, than as slow mode later.
output driver current status.
will be updated by internal auto A/D BLC circuit, and write a value to this register with SCCB
has no effect. If COMG2=1, Y channel offset adjustment will use the register stored value
which can be changed by SCCB. If COMF1=0, this register has no adjustment effect to A/D
output data. If output RGB raw data, this register will adjust R/G/B data.
COME6
Y6
0
0
COME5
Y5
0
0
COME4
Y4
0
0
Preliminary
COME3
Y3
0
0
COME2
Y2
0
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Company Confidential
OMNIVISION TECHNOLOGIES INC.
COME1
Y1
0
0
COME0
Y0
0
0