VS6724 datasheet(65/118 Pages) STMICROELECTRONICS

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VS6724

Programming model and register description

65/118

0x0440

bJpegSqueezeSettings

Default value

0x00

Purpose

Select JPEG compression control

Type

BYTE

Possible values

<0> User Squeeze mode - Sets the VC squeeze setting as user

squeeze (e.g. quality based setting). Low, medium or high quality factor

should be set to override these settings

<1> Auto Squeeze mode - Sets the VC squeeze setting as auto squeeze

(file size based setting).

<2> Auto still capture mode - If the host is taking only one still, the

engine calibrates and waits for 5-10 frames to work out compression

settings to reach optimum squeeze for target file size.

0x0443(MSB)

0x0444(LSB)

bJpegTargetFileSize

Default value

0x02ee (750KB)

Purpose

sets target file size KByte

Type

UINT16

0x0446

bJpegImageQuality

Default value

0x00

Purpose

Sets target JPEG image quality setting for Auto Squeeze mode

Type

BYTE

Possible values

<0>High Quality

<1> Medium Quality

<2> Low Quality

0x0448

bJpegImageFormat

Default value

0x00

Purpose

Sets image format supplied to JPEG engine

Type

BYTE

Possible values

<0>YCbCr 422 <1> YCbCr 420

0x044c

bMinScalerFactor

Default value

0x10

Purpose

Sets the minimum scaling factor which can be achieved by the zoom

operation, this can be used to limit the max PCLK rate.

Type

BYTE

Possible values

0x00 - 0xff

Can be controlled in all stable state. # denotes registers where changes will only be consumed during the transition to a

RUN state.

It is possible to switch between any YCbCr (422) mode, RGB mode and Bayer 10bit or move between YCbCr 400 and a

Bayer8 mode without a requiring a transition to STOP, it is not possible to move between these groups of modes without

first a transition to STOP then a BOOT.

Table 15.

PipeContext1 (continued)

Index

PipeContext1(1)

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