ST92196A STMicroelectronics, ST92196A Datasheet - Page 118

• Manufacturer Part Number: ST92196A
• Description: 8/16-bit Mcu For Tv Applications With Up To 96k Rom, On-screen-display And 1 Or 2 Data Slicers
• Manufacturer: STMicroelectronics

- ON SCREEN DISPLAY CONTROLLER (OSD)
OSD CONTROLLER (Cont’d)
If the italic attribute is still active at the end of the
Figure 55. Rounding and Fringe
row, the last character code to be displayed is
Drawing Conventions:
truncated to the vertical position where it would
have finished without the italic attribute.
Foreground
Rounding
Fringe
Dot Size
Dot Size
Dot Size
If the background color is changed while italics are
9 x13
enabled, then the color attribute (seen as a space)
is not slanted.
18 x 26
The right edge background corresponding to a
control character is never slanted.
Rounding and Fringe in Size (1X,1Y)
When a background code follows an italic charac-
ter, then the background color of the italic charac-
ter extends half way into the displayed background
code location, regardless of the background Pal-
ette M bit (refer to
Section 8.5.6.4
for a description
of the M bit).
In the case where a background code is followed
by a second background code while italics are on,
the first background color will extend half way into
the second background location.
9X13 Matrix
18x26 Matrix
The edges of the 00h code (test character seen as
Rounding and Fringe
Rounding and Fringe
a border color) are never slanted.
in Size (1.5X,2Y)
in Size (1.5X,1Y)
(9x13 Matrix only) Partial details
(9x13 Matrix only)
The right edge of the 00h code is never slanted.
When a 00h code follows an italic character, then
the background color of the italic character ex-
tends half way into the 00h code location.
In case a 00h code is followed by a background
code while italics are on, the 00h code is never ex-
tended into the following code location.
Rounding and Fringe in Size (2X,2Y) for 18x26
8.5.3.7 Rounding and Fringe
Rounding can be enabled or disabled row by row
(see
Section
8.5.8.3).
For a 18x26 matrix size, there is no rounding facil-
ity when the character size is (1X,1Y).
For any other (X,Y) size combinations, the round-
ing facility is allowed for the 18x26 font matrix, and
rounding is available in any of the 3 row modes
Partial details
(serial, basic parallel, extended parallel).
The fringe mechanism can be enabled or disabled
Rounding and Fringe in Size (4X,4Y) for 18x26
row by row (see row attributes description), but it
can also be defined on a character basis in ex-
tended parallel mode (see shape parallel at-
tributes for more details).
The fringe mechanism can be activated for any
size and both matrix formats.
Please note that, for both matrixes, in the case of
fringe usage in 1Y vertical size and interlaced
mode, a flicker may appear on the screen as the
fringe information is built on a field basis.
Partial details
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