ST92196A datasheet(115/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

8.5.3.1 Display Attributes

Global screen attributes:

– Border color

– Border translucency

– Turn all background color into border color

Row parameters and attributes:

– Row mode control (serial, basic parallel, extend-

ed parallel)

– Row character count

– Horizontal and Vertical shift

– Active Range (used for vertical scrolling)

– Font matrix selection

– Size control (dot height and width definition)

– Flashing control

– Rounding control

– Fringe control

Serial character attributes:

– Background color (16 user definable colors)

– Foreground color (16 user definable colors)

– Flashing control

– Italics control

Palette parallel character attributes:

– Background color (16 user definable colors)

– Foreground color (16 user definable colors)

Shape parallel character attributes:

– Character code extension

– Double height

– Double width

– Foreground palette extension (32 user definable

colors)

– Background palette extension (32 user definable

colors)

– Flashing control

– Shadowing control

– Fringe control

Mouse Pointer attributes:

– Fringe control

– Rounding control

– Foreground color (32 user definable colors)

– Double size

– Horizontal and Vertical position

8.5.3.2 OSD Area

When the Display controller is turned on, the TV

screen will show a specific color prior to any data

display which is called the “Border Color”. The ef-

fective border color is fully software programmable

from a palette of 512 colors through 2 control reg-

isters.

The border area translucency can be chosen from

8 different levels, from fully transparent to fully

opaque. The 3 translucency control bits are acces-

sible through the border color control registers.

When data are displayed by the OSD, they form

rows of characters. All characters of one row are

horizontally aligned.

For each displayed character, two kinds of colors

must be programmed which are defined as:

– Background color

– Foreground color

Figure 52. OSD Area Description

8.5.3.3 Color Processing

Further color elements may be generated by the

Display controller as a result of real time pixel cal-

culations (they are not stored in the Font ROM

memory). These are:

– Rounding pixels: they must be considered as

“calculated” foreground pixels.

– Fringe pixels: they are always displayed with a

black color and are never translucent.

– Underline pixels: they must be considered as

“calculated” pixels. Their colors are defined

through independent underline color values.

Translucency levels are also programmable for

underline pixels.

Border Color

1 Character row

1 Displayed character

Background color

Foreground color

Area

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