ST92185B datasheet(101/178 Pages) STMICROELECTRONICS

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ST92185B - ON SCREEN DISPLAY (OSD)

ON SCREEN DISPLAY (Cont’d)

7.4.4.3 Parallel Attributes

Figure 61. Example of Row in Parallel Mode

Each character is defined on 2 bytes in Parallel

Mode (see Figure 13.)

Parallel Mode is selected by setting the SPM bit in

the DCM1R register R251 (FBh) Page 32.

It requires 2 bytes per character. Display charac-

ters are coded through a second byte processed in

parallel with the character code.

It does not handle Teletext and is used mainly for

TV menus (e.g. for channel searching or volume

control).

The attribute can be one of two types defined by

most significant bit (PS):

– Color attribute

– Shape attribute

US: Underline / Separate Mosaic graphics (see

above).

DH: Double Height: The half character is displayed

in the current row depending on the Upper Height

control bit. The Double Height action is not propa-

gated in the row.

Note: When a parallel double height attribute is

decoded in Row 23, the characters of the first sta-

tus row are not affected and are still displayed.

UH: Upper Half. This bit is active when the current-

ly displayed row writes the upper half-character in

case of double height or double size attribute.

DW: Double Width (see above).

BX: Boxing window.

SR: Smooth Rounding.

FR, FG, FB: Foreground color.

BR, BG, BB: Background color.

HI: Half Intensity (background only).

CSS: Character extended menu code selection.

PS: Parallel attribute selection

A R D O Z

A A

A * *

Background (half intensity)

Foreground (full intensity)

Characters Location

Display

Propagation

Default foreground

Default background

global

Attributes Location

A R D O Z

A A

A * *

VR02115D

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