STC-A33A
User Guide
23
Rev 1.0
3. Edge Preset Trigger Mode (Non-Reset, Internal Sync)
Note 1: The camera does NOT switch to the normal mode when the long exposure mode is selected. This timing chart
shows when the long exposure mode selected.
Note 2: The internal VD signal does not reset by the trigger signal. The video output signal is sent out at the next internal
reset VD timing.
Note 3: The exposure time is controlled by the camera setting communication (Refer to the command 20H and 21H) or
the DIP Switch on the rear panel as “shutter speed”.
Note 4: External VD signal input continuously during the external sync mode. External VD signal is disregarded during
the trigger mode.
Note 5: The WEN signal does not output when the exposure by the trigger signal does not exists during the trigger mode.
4. Edge Preset Trigger Mode (Exposure Timing)
Notes:
The trigger signal equals to or shorter than 30 clocks is removed by the filtering system.
The input trigger signal has to be more than 31 clocks pulse width.
The exposure starts
63
clocks after the rising edge of the trigger signal.
Normal mode
Exposure time
Trigger mode
Normal mode
A u t o m a t i c a l l y s w i t c h e s t o t h e
n o r m a l m o d e i f t h e p u l s e w i d t h
o f t h e t r i g g e r s i g n a l i s m o r e
t h a n 5 0 0 m s e c
N o t e . 1
Function mode
Internal VD
CCD exposure
Trigger signal
(Rising edge)
Video out
N o t e . 3
WEN signal out
N o t e . 4
Next
VD
N o t e . 2
Next
VD
Next
VD
Trigger
signal
Exposure
time
T1'
SUB
SG
Exposure time: T1' =
Preset exposure time for the electronic shutter
Filtering (Note.1)
30CLK
