TDA9550 datasheet(46/125 Pages) PHILIPS

46 / 125 page

2000 Jun 22

Philips Semiconductors

Tentative Device Speciﬁcation

TV signal processor-Teletext decoder with

embedded

µ-Controller

TDA955X/6X/8X PS/N1 series

TXT: The control character “New background” (“1Dh”) is

used to change the background colour to the current

foreground colour. The selection is immediate (“Set at”)

and remains valid until the end of the row or until otherwise

modified.

The TEXT background control characters map to the

CLUT entries as shown below:

BACKGROUND DURATION

The attribute when set takes effect from the current

position until to the end of the text display defined in

REG4:Text Area End.

CC: The background duration attribute (see Table 18,

Serial Mode 1, bit 8) in combination with the End Of Row

attribute (see Table 18, Serial Mode 1, bit 9) forces the

background colour to be display on the row until the end of

the text area is reached.

TXT: This attribute is not available.

UNDERLINE

The underline attribute causes the characters to have the

bottom scan line of the character cell forced to foreground

colour, including spaces. If background duration is set,

then underline is set until the end of the text area.

CC: The underline attribute (see Table 18, Serial Mode

0/1, bit 4) is valid from the time set until end of row or

otherwise modified.

TXT: This attribute is not available.

OVERLINE

The overline attribute causes the characters to have the

top scan line of the character cell forced to foreground

colour, including spaces. If background duration is set,

then overline is set until the end of the text area.

CC: The overline attribute (see Table 18, Serial Mode 0/1,

bit 5) is valid from the time set until end of row or otherwise

modified. Overlining of Italic characters is not possible.

TXT: This attribute is not available.

END OF ROW

CC: The number of characters in a row is flexible and can

determined by the end of row attribute (see Table 18,

Serial Mode 1, bit 9). However the maximum number of

character positions displayed is determined by the setting

of the REG2:Text Position Horizontal and REG4:Text Area

End.

NOTE: When using the end of row attribute the next

character location after the attribute should always be

occupied by a ’space’.

TXT: This attribute is not available, Row length is fixed at

40 characters.

FRINGING

A fringe (shadow) can be defined around characters. The

fringe direction is individually selectable in any of the

North, South, East and West direction using

REG3:Fringing Control. The colour of the fringe can also

be defined as one of the entries in the CLUT, again using

REG3:Fringing Control.

CC: The fringe attribute (see Table 18, Serial Mode 0, bit

9) is valid from the time set until the end of the row or

otherwise modified.

TXT: The display of fringing in TXT mode is controlled by

the TXT4.SHADOW bit. When set all the alphanumeric

characters being displayed are shadowed, graphics

characters are not shadowed.

Fig.16 South and Southwest Fringing

MESHING

The attribute effects the background colour being

displayed. Alternate pixels are displayed as the

background colour or video.The structure is offset by 1

Control Code

Deﬁned Colour

CLUT Entry

00h+1Dh

Black

01h+1Dh

Red

02h+1Dh

Green

03h+1Dh

Yellow

04h+1Dh

Blue

05h+1Dh

Magenta

06h+1Dh

Cyan

07h+1Dh

White

Table 15 Background CLUT mapping

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