STV-DCASLASHVGA-E01 datasheet(14/60 Pages) STMICROELECTRONICS

14 / 60 page

PRELIMINARY

Digital Camera Chipset; Customer Datasheet, Rev 3.0, March 2000

STV0680A + VV6444/6410/6500

CDSTV0680F-C

Commercial in confidence

STV0680F_contents.fm

Camera modes of operation

The above modes are interrupted by the detection of a USB or RS232 connection. This is to allow for the possibility that the PC

driver takes control of the chipset (e.g. when starting a VfW application through USB).

3.1

Standby mode (or USB suspend mode)

3.1.1

Entering this mode

The camera enters standby mode automatically after 30 seconds of inactivity if not tethered to USB, or when USB suspend mode

is activated by the PC driver.

3.1.2

Description

This allows image data to be stored in memory with extremely low power consumption, which appears to the user as if the

camera is switched ‘off’, since there is no LCD display or LED lit. In VV6444-based designs, STV0680A powers off the sensor

completely, in VV6410/6500 based designs, the sensor is placed in suspend mode, and the camera enters a mode where only

SDRAM refresh is carried out. The shutter button is inactive in standby mode.

3.1.3

Exiting this mode

Wake-up from standby mode is achieved by any of the following means:

1. Pressing the ‘mode’ button (only if no USB detected)

Mode

If shutter button pressed while in

this mode

If mode button

pressed while in this

mode

If no further

action

LCD

displays

Standby

mode

No function - pictures cannot be taken in

standby mode

Wakes up camera into

‘Snapshot’ mode

Remains in

standby mode

(Display is

blank)

’Snapshot’

mode

Takes one picture, if sufficient light availa-

ble, then returns to ‘Snapshot’ mode

Moves to continuous cap-

ture mode

Stays in ‘Snap-

shot’ mode for

30 seconds then

moves to

standby mode

Number of pic-

tures still avail-

able to take

Continu-

ous cap-

ture

Takes a picture every 80mS while button

pressed, regardless of light available, then

returns to ‘Snapshot’ mode

Moves to self timer mode

Returns to

‘Snapshot’ mode

after 5 seconds

Number of pic-

tures still avail-

able to take

Self timer

Takes one picture after a 10 second count-

down, if sufficient light available, then

returns to ‘Snapshot’ mode

Moves to ‘Clear camera’

mode

“St”

’Clear

camera’

(1st press:)

Prompts user to

clear camera

(2nd press:) Clears all

images stored in cam-

era, then returns to

‘Snapshot’ mode

Moves to ‘Change resolu-

tion’ mode (see note)

“CL”

’Change

resolution’

Changes resolution (i.e. Low to High, or

High to Low) and returns to ‘Snapshot’

mode

Returns to ‘Snapshot’

mode

If currently in

Low Resolu-

tion: “Hr”

If currently in

High resolu-

tion: “Lr”

Table 6 : Camera modes

Note: In STV0680-001, pressing the Mode button while in ‘Clear Camera’ mode only moves onto ‘Change resolution’ mode if the

camera has no images stored. This is because in STV0680-001, mixed resolutions (i.e. ‘High’ and ‘Low’) cannot be stored at the

same time. In STV0680A-002, mixed resolutions can be stored at the same time.

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