Specifications

The bits of the parameter value are divided into three different sized bit groups
a, b and c. Each bit group has a special function, being independent of the other
ones:
• a: Controls the output of background correction module. Besides the nor-
mal background correction mode, the actual memory content (H/U) of the
integrator can also be output. In this case the correction module becomes
an image source itself. It provides a simple image storage function.
• b: Defines the number of images to be integrated and starts the integra-
tion process as soon as a new value is set.
• c: Indicates whether the last started integration is still running. This bit
can only be read out; during write access to U, it is ignored.
The table below illustrates the possible values for the individual bit groups:
Example
Note

The bit group a is split into two separate areas (see the table
below).
U0
Operation Mode
Background Correction
FEDCBA9876543210
--------c --abbba
ro rw rw rw rw rw
Bit group Value (hex) Explanation
a 0 Output: deactivated. Data are passed through transparently.
1 Output: activated. Apply the current correction image (H/U) and offset
value M.
2 Output: activated. Output of current correction image (H/U).
b 0 Integration: deactivated. The image storage content is not changed.
1 Integration: 1 image. The following image is copied into the image
storage.
4 Integration: 8 images. The following 8 images are integrated and the
result is copied into the image storage.
5 Integration: 16 images. The following 16 images are integrated and the
result is copied into the image storage.
6 Integration: 32 images. The following 32 images are integrated and the
result is copied into the image storage.
7 Integration: 64 images. The following 64 images are integrated and the
result is copied into the image storage.
c 0 Integration completed. (This value can only be read out.)
1 Integration still running. (This value can only be read out.)
Note: The Integration is activated by change of the bit group b of U.
Example: If a further integration of 64 images is subject to be started, directly following the inte-
gration of 64 images, another value has to be written into the register first.
Example: U=E, U=0, U=E.
Table 36: Parameter U: values