Configuration MC132x
Users Manual Rev. 0.22
29
6.17.3 ImageBLITZ® registers
Register Bit Description
r7
0
= 1: activate ImageBLITZ®
r8
6..0 First pixel mod. 10
r9
6..0 Last pixel mod. 10
rA
h
7..0
8
9
Exposure threshold
1: bright object triggers
0: dark object triggers
1: make triggerline visible
rB
h
6..0
8..7
9
Number of exceedings or fall backs, release con-
dition,
X – tracking correction
X – tracking enable.
rC
h
9..0 Address of triggerline
rD
h
7..0 exposure limitation, number of exposures without
exposure condition until an image is captured
Table 6.17-1
Registers r1..r7 are programmed according to image size and position and for
Asynchronous operation,
timer
.
Register Bit
Description
r1, r3..r5
Image size and position
r2
r6
9..0
7..4
Async operation, timer
0fh
Table 6.17-2
6.17.4 ImageBLITZ® setup
The MC131x is configured for
asynchronous operation with timer
, registers r8, r9 and rC
h
are loaded
for the desired position of the trigger line. Register rB
h
is loaded with 0, register rA
h
with 201
h,
so that
the trigger line is visible.
L
If the image is zoomed down for display by an applica-
tion program, every other line may be omitted and the
trigger line may then disappear.
ImageBLITZ® is enabled with Register r7 Bit1=1.
Now position the trigger line with the registers r8, r9 and rC
h
across the object that is used for the shut-
ter release..
Clear Bit 8 in Register rA
h
if a bright objects releases the shutter, set rA
h
[8] if dark objects release the
shutter. While the trigger line is placed across the object, raise threshold with rA
h
[7..0] until as many
dashes from the trigger line disappear as are loaded in Register rB
h
[6..0]. This is called the release con-
dition.
If it is expected that the release condition is met more than once for a single object, load rB
h
[9..7] with
a number of exposed lines that will not met the release condition before exposing one image.
