Instruction manual

Controlling image capture
MARLIN Technical Manua
l
Page 57
9.2 One-Shot
The camera can record an image by setting “OneShot” in the 61Ch register. This bit is
automatically cleared after the image is captured. If the camera is placed in Iso_Enable mode
(see ISO_Enable / Free-Run), this flag is ignored.
If OneShot mode is combined with the external trigger, the “OneShot” command is used to arm
it. The following screenshot shows the sequence of commands needed to put the camera into this
mode. It enables the camera to grab exactly one image with an external trigger edge.
If there is no trigger impulse after the camera has been armed, OneShot can be cancelled by
clearing the bit.
Figure 37: One_shot control
9.2.1 OneShot command on the bus to start of exposure
The following sections describe the time response of the camera using a single frame (OneShot)
command. As set out in the IIDC specification, this is a software command that causes the
camera to record and transmit a single frame.
The following values apply only under the condition that the camera is in idle and ready for use.
Full resolution must also be set.
OneShot->Microcontroller-Sync: <=500 µs (processing time in the microcontroller)
µC-Sync/ExSync->Integration-Start 8 µs
Microcontroller-Sync is an internal signal. It is generated by the microcontroller to initiate a
trigger. This can either be a direct trigger or a release for ExSync if the camera is triggered
externally.