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Controlling image capture
OSCAR Technical Manual V2.4.0
114
Microcontroller sync is an internal signal. It is generated by the microcon-
troller to initiate a trigger. This can either be a direct trigger or a release for
ExSync, if the camera is externally triggered.
End of exposure to first packet on the bus
After the exposure, the CCD sensor is read out; some data is written into the
FRAME_BUFFER before being transmitted to the bus.
The time from the end of exposure to the start of transport on the bus is:
500 µs ± 62.5 µs
This time jitters with the cycle time of the bus (125 µs).
Figure 52: Data flow and timing after end of exposure
One-shot command
μC ExSync
Exposure
Integration start
Timebase reg.
X
Shutter reg.
Offset
Processing delay
< 250 μs
= 8 μs
Interlaced/progressive
Oscar F-320: 46 / 57 µs
Oscar F-510: 74 / 83 µs
Oscar F-810: 98 / 98 µs
timebase x shutter + offset = exposure time
First packet on bus
= 500 μs
+/-62.5 μs