ov7620 OmniVision Technologies, Inc, ov7620 Datasheet - Page 31

• 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 12 - rw: Common control A
Register 13 - rw: Common control B
Bits
Default
Bits
Default
.
COMA7 - “1” initiates the chip soft reset, the reset takes place after the acknowledge bit is issued, the
COMA6 - “1” selects mirror image
COMA5 - “1” enables AGC. “0” - stop AGC and set register [00] to default value. Only effective in auto
COMA4 - “1” select 8 Bit Digital output format is Y U Y V Y U Y V ...
COMA3 - “1” selects raw data signal as video data output, “0” selects YCrCb as video data output. The
COMA2 - “1” enable auto white balance, “0” AWB stop and AWB register [01] and [02] value is held at last
COMA1 - “1” selects Color Bar Test pattern output.
COMA0 - “1” select precise A/D Black Level Compensation (BLC) line method. “0” use standard black level
COMB7 - Reserved.
COMB6 - Reserved.
COMB5 - “1” selects 8 bit data format, Y/CrCb and RGB video data is multiplexed to the eight bit Y bus, tri-
COMB4 - “0” enables digital output in CCIR601 format. “1” enables CCIR656 format.
COMB3 - “0” selects horizontal sync for output to pin CHSYNC, “1” selects composite sync for output.
COMB2 - “1” tri-states bus Y<7:0> and UV<7:0>, “0” enables both buses.
COMB1 - “1” initiates the single frame transfer, for this function to work, field drop mode (FD<1:0> in regis-
COMB0 - “1” enables auto adjust mode, in this mode, internal exposure circuitry overwrites those parame-
COMA7
COMB7
0
-
effect is the same as power up the chip, the chip is initialized to a default state, all registers
including SCCB’s contents are set to default, this bit is self cleared after the reset.
adjust mode.
selection applies to both analog video and digital video.
updated value. Can used as one-shot AWB mode. Valid only in auto mode.
compensation to do A/D BLC field method which is more stable but less precise.
state UV bus; “0” selects 16 bit format, data go to both Y<7:0> bus and UV<7:0> bus.
ter [16]) must set to “OFF”. See figure below. After this bit is set, for Interlaced mode, HREF is
only asserted for consecutive two fields beginning at Odd field. This bit is cleared automati-
cally at the end of this frame. For Progressive Scan mode, HREF is only asserted for one
frame. Clearing this bit in the middle of active frame has no effect to the assertion of current
HREF.
ters in registers [00]~[02], the chip adjusts the image based on a preset algorithm. “0” manual
adjust mode.
COMA6
COMB6
0
-
COMA5
COMB5
1
0
COMA4
COMB4
0
0
Preliminary
COMA3
COMB3
0
0
COMA2
COMB2
1
0
Company Confidential
OMNIVISION TECHNOLOGIES INC.
COMA1
COMB1
0
0
COMA0
COMB0
0
1