Mikrotron MC1302, User Manual, Page: 24 / 53

Configuration MC13xx Users Manual Rev. 1.19
24
Command:
:rf<0|1>
<0>
... deselect external sync signal
<1>
... select external sync signal
Response: none
Make sure that a sync signal is present on EXP/CC1 before this command is issued or the “trigger on
CC1” button is pressed on the MC13xx camera configuration tool.
The polarity of the sync signal can be selected with the
_Polarity_of_EXP-signal
6.8.6 Frame rate with asynchronous exposure
The frame rate with asynchronous exposure = Frame rate with synchronous exposure – (1 / exposure
time).
6.8.7 Asynchronous exposure, shutter control by pulse width
This operating mode is selected with register 6:
:r6[7..4]
= 0xb
Exposure time depends on the width of the external EXP – signal.
6.8.8 Asynchronous exposure, shutter control by timer
This operating mode is selected with register 6:
:r6[7..4]
= 0xf
The asynchronous exposure time is dependent on :r2[9..0]. The exposure timer counts as many lines as
are defined in register :r2[9..0].
Exposure time:
T
B
= 1/F
sens
* 136
•
(1+r2[9..0]) [Sec]
T
B
... exposure time
F
sens
.. sensor clock
example:
sensor clock = 66MHz
value of r2[9..0] = 6
T
B
= 136
•
6
•
15 ns = 12,2 µs