Specifications

Configuration MC13xx Users Manual Rev. 1.19
22
6.8.1.2 Asynchronous exposure
With asynchronous exposure, an external signal starts exposure, and the exposed image is output imme-
diately after the exposure ends. Exposure time is defined either by an internal timer or by the width of
the external EXP (CC1) signal. The time between two consecutive EXP (CC1) edges can be indefinite.
Frame rate = 1/(exposure time + image output time). Image output time equals the selected free running
frame rate. Use MC13xx camera configuration tool for selection.
The following registers select exposure type:
Register Bits :r6[7..4] :r7[8] :rf[0]
camera stop xxx0 x x
Synchronous without elec-
tronic shutter
0001 0 0
Synchronous with electronic
shutter
0011 0 0
Synchronous with electronic
shutter and external synchro-
nisation signal, positive edge
0011 0 1
Synchronous with electronic
shutter and external synchro-
nisation signal, negative edge
0011 1 1
Asynchronous, pulsewidth,
positive edge
1011 0 0
Asynchronous, pulsewidth,
negative edge
1011 1 0
Asynchronous, timer, positive
edge
1111 0 0
Asynchronous, timer, nega-
tive edge
1111 1 0
Table 6.8-1
6.8.2 Frame rate with synchronous exposure
The frame rate with synchronous exposure is direct proportional to the selected number of lines.
The time for one line is:
T
zz
= 1/F
sens
• 136 [sec]
T
zz
...time/line
F
sens
... Sensorclock
Frame rate: = 1 / (time/line • number of lines+1) or:
= F
sens
/ (136 • (r3[9..0] +2))
Dependencies between image size and frame rate for typical clock frequencies are given in the follow-
ing table: