STV0974 datasheet(48/69 Pages) STMICROELECTRONICS

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STV0974

Functional description

Note:

Access to the bits mentioned here above is done through a read-modify-write sequence. As an

example, when torch mode is set:

- when in idle mode:

set 0x8A44 bit[6] to 0 to enable the torch mode

set 0x8A43 bit[2:0] to 7 to light the torch (if the torch is active high)

- go into required Active mode (still/live or ViewFinder):

set 0x8A43 bit[2:0] to 0 to extinguish the torch

In the case of flash mode:

- when in idle mode:

set 0x8A45 bit[6] to 1 to set the flash pulse active low (default setting is flash pulse active high)

set 0x88D4 bit[2:0] to 7 to set the flash pulse length to 8 video lines

set 0xA104 bit [7:0] to 0 to set 0 transfer frame delay

set 0xA500 bit[3:0] to 5 to set white balance to “daylight” fixed setting

- go into flash mode:

the system automatically goes back to Idle.

Table 33: Flash mode management [register group 6]

Name

Index

R/W

State

code

Data

type

Format

default

Description

Torch polarity

0x8A43

R/W

RRRR.RDDD

RRR.R000

Bit[2:0]=0: Torch output (pin

DIO12) signal is low

Bit[2:0]=7: Torch output (pin

DIO12) signal is high

Torch control

0x8A44

R/W

RDRR.RRRR

R1RR.RRRR

Bit[6]=0: Torch output (pin DIO12)

pad enable.

Bit[6]=1: Torch output (pin DIO12)

pad in high impedance

Flash pulse

polarity

0x8A45

R/W

RDRR.RRRR

R0RR.RRRR

Bit[6]=0: Flash pulse active high.

Bit[6]=1: Flash pulse active low.

Flash pulse length

0x88D4

R/W

RRRR.RDDD

0000.0000

Bit[2:0]: line length - 1

Default is 0, corresponding to 1

video line (maximum pulse allowed

is 8 video lines).

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