OV7620 datasheet(30/60 Pages) ETC

30 / 60 page

OV7620 Product Specifications - Rev. 1.2 (5/13/00)

OMNIVISION TECHNOLOGIES INC.

Preliminary Company Confidential

COMA7 - “1” initiates the chip soft reset, the reset takes place after the acknowledge bit is issued, the

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.

COMA6 - “1” selects mirror image

COMA5 - “1” enables AGC. “0” - stop AGC and set register [00] to default value. Only effective in auto

adjust mode.

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

selection applies to both analog video and digital video.

COMA2 - “1” enable auto white balance, “0” AWB stop and AWB register [01] and [02] value is held at last

updated value. Can used as one-shot AWB mode. Valid only in auto mode.

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

compensation to do A/D BLC field method which is more stable but less precise.

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-

state UV bus; “0” selects 16 bit format, data go to both Y<7:0> bus and UV<7:0> bus.

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-

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.

COMB0 - “1” enables auto adjust mode, in this mode, internal exposure circuitry overwrites those parame-

ters in registers [00]~[02], the chip adjusts the image based on a preset algorithm. “0” manual

adjust mode.

Bits

COMA7

COMA6

COMA5

COMA4

COMA3

COMA2

COMA1

COMA0

Default

Bits

COMB7

COMB6

COMB5

COMB4

COMB3

COMB2

COMB1

COMB0

Default

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