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PRELIMINARY
Digital Camera Chipset; Customer Datasheet, Rev 3.0, March 2000
STV0680A + VV6444/6410/6500
CDSTV0680F-C
Commercial in confidence
16
T
STV0680F_contents.fm
3.5.2
The LCD displays “CL”. Pressing shutter button twice will clear all the images in the camera.
Description
3.5.3
After 5 seconds of non-activity, or after the camera has been cleared, the camera returns to standby mode.
Exiting this mode
3.6
‘Change resolution’
3.6.1
This is enabled using the mode button (from ‘Snapshot’ mode, press four times).
Entering this mode
Note: In STV0680-001, the images stored in memory must be cleared before this mode can be entered. This is because in
STV0680-001, mixed resolutions (i.e. ‘High’ and ‘Low’) cannot be stored at the same time.
3.6.2
The LCD displays the target resolution to which the camera can be changed, i.e. if in High resolution “Lr” (Low resolution) is
displayed, if in Low resolution, “Hr” (High resolution) is displayed. ‘High’ resolution stores the full image resolution from the sensor
array, while ‘Low’ subsamples the sensor array, to store 4x the number of images (e.g. 80 in QCIF mode, compared to 20 in CIF
mode).
Description
Dependant on the type of sensor used, different resolutions are obtained, see Table 4 or Table 5. By pressing the shutter button,
user changes the resolution.
3.6.3
After 5 seconds of non-activity, or after the resolution has been changed, the camera returns to standby mode.
Exiting this mode
3.7
Tethered USB Video mode
3.7.1
This is activated by the PC Video for Windows driver while the camera is tethered, dependant on whether VfW is supported (see
Table 3).
Entering this mode
3.7.2
The camera is controlled by the PC driver.
Description
Note: Any images or continuous image sequences contained in the camera are lost when the video for Windows driver starts.
3.7.3
This is controlled by the PC drivers.
Exiting this mode
3.8
Powering the camera off
3.8.1
This is not truly a mode of operation, but a description of what happens if:
Entering this mode
The battery power and USB connection are removed from the camera
The battery power is removed, and the PC to which the camera is tethered, is switched off.
The battery voltage falls extremely low. Ways of avoiding this situation are discussed in the reference design, see Section 9.
Note: normally a camera with USB interface should source power from the USB connection, but this is hardware dependant, see
Section 9.
3.8.2
In this situation, all image data is lost.
Description
Note: under certain circumstances, the image data may be maintained if the camera or PC is powered on again after a few