ST92185B datasheet(99/178 Pages) STMICROELECTRONICS

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ST92185B - ON SCREEN DISPLAY (OSD)

ON SCREEN DISPLAY (Cont’d)

Table 17. Serial Attribute Codes

Notes:

(1) Presumed at the start of each display row or

can be defined in global register

(2) Action “set at” (on current character) others are

“set after” (on next character)

(3) ALWAYS active (even in Full Page Serial

Mode, i.e. for Text Level 1)

(4) Toggles action if the Fringe Enable is set (bit 5

in register DCM0R R250 (FAh) Page 32. Selects a

second G0 if the Switch Enable bit is set (bit 5 in

Flash: (/= Steady) The next characters are dis-

played with the foreground color alternatively

equal to background and foreground on a period

based on Vsync (32 Vsync: foreground, 16 Vsync:

background) until a Steady serial attribute.

Fringe: If the Fringe Enable bit is set in the global

attribute register DCM0R R250 (FAh) Page 32, the

next characters are displayed with a black fringe

(half dot) until the decoding of another fringe at-

tribute coded 1Bh (toggle effect).

Conceal: (/= Reveal) The next characters are dis-

played as space characters (Background color)

until a foreground color character is encountered.

Conceal mode is set by the conceal enable control

bit in the register DCM0R R250 (FAh) Page 32.

Boxing: A part of the page (where this bit is active)

is inserted in a specific window depending on 3

control bits defined in the FSCCR register. (see

Figure 11)

To respect the Teletext Norm, the box in serial

mode, starts when two Box-on attributes are en-

countered, and stops when two Box-offs are en-

countered.

Double Height: The upper halves of the charac-

ters are displayed in the current row, the corre-

sponding lower halves of characters are displayed

(with same display attributes) in the next row (in-

formation received for this row must be ignored).

Note: When a serial double height attribute is de-

coded in Row 23, the characters of the first status

row are not displayed. To avoid this effect, remove

the serial double height attribute from Row 23.

Figure 58. Mosaic Characters

Note: Hold Mosaic: (/= Release) The last mosaic

character is repeated once instead of the current

space character.

b[7:3]

00000

00001

00010

00011

b[2:0]

Foreground Color

(Alpha Chars)

Foreground Color

(Mosaic Chars)

000

Black

Flash

Black (3)

Conceal (2)

001

Red

Steady (1, 2)

Red

Contiguous Mosaic (1, 2)

010

Green

Box OFF (1)

Green

Separated Mosaic (2)

011

Yellow

Box ON

Yellow

Fringe or 2nd G0 font (3, 4)

100

Blue

Normal Height (1,2)

Blue

Black Background (1, 2)

101

Magenta

Double Height

Magenta

New Background (2)

110

Cyan

Hold Mosaic (2)

111

White (1)

White

Release Mosaic (1)

Contiguous Mosaic

Separated Mosaic

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