ST92196A datasheet(118/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

If the italic attribute is still active at the end of the

row, the last character code to be displayed is

truncated to the vertical position where it would

have finished without the italic attribute.

If the background color is changed while italics are

enabled, then the color attribute (seen as a space)

is not slanted.

The right edge background corresponding to a

control character is never slanted.

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.

The edges of the 00h code (test character seen as

a border color) are never slanted.

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.

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

(serial, basic parallel, extended parallel).

The fringe mechanism can be enabled or disabled

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.

Figure 55. Rounding and Fringe

Foreground

Dot Size

Rounding

Dot Size

Fringe

Dot Size

9 x13

18 x 26

Drawing Conventions:

Partial details

Rounding and Fringe in Size (2X,2Y) for 18x26

Rounding and Fringe

(9x13 Matrix only) Partial details

(9x13 Matrix only)

Rounding and Fringe

Partial details

9X13 Matrix

18x26 Matrix

Rounding and Fringe in Size (1X,1Y)

in Size (1.5X,2Y)

in Size (1.5X,1Y)

Rounding and Fringe in Size (4X,4Y) for 18x26

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