TDA9554PS datasheet(47/125 Pages) PHILIPS

47 / 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

pixel from scan line to scan line, thus achieving a checker

board display of the background colour and video.

TXT: There are two meshing attributes one that only

affects black background colours TXT4.BMESH and a

second that only affects backgrounds other than black

TXT4.CMESH. A black background is defined as CLUT

entry 8, a none black background is defined as CLUT entry

9-15.

CC: The setting of the Mesh bit in REG0:Display Control

has the effect of meshing any background colour.

Fig.17 Meshing and Meshing / Fringing (South+West)

CURSOR

The cursor operates by reversing the background and

foreground colours in the character position pointed to by

the active cursor position. The cursor is enabled using

TXT7.CURSOR ON. When active, the row the cursor

appears on is defined by TXT9.R<4:0> and the column is

defined by TXT10.C<5:0>. The position of the cursor can

be fixed using TXT9.CURSOR FREEZE.

CC: The valid range for row is 0 to 15. The valid range for

column is 0 to 47. The cursor remains rectangular at all

times, it’s shape is not affected by italic attribute, therefore

it is not advised to use the cursor with italic characters.

TXT: The valid range for row positioning is 0 to 24.The

valid range for column is 0 to 39.

SPECIAL GRAPHICS CHARACTERS

CC/TXT: Several special characters are provided for

improved OSD effects. These characters provide a choice

of 4 colours within a character cell. The total number of

special graphics characters is limited to 16. They are

stored in the character codes 8Xh and 9Xh of the character

table (32 ROM characters), or in the DRCs which overlay

character codes 8Xh and 9Xh. Each special graphics

character uses two consecutive normal characters.

Fringing, underline and overline is not possible for special

graphics characters. Special graphics characters are

activated when TXT21.OSD_PLANE = 1.

The example in Fig.19 can be done with 8 special graphics

characters.

If the screen colour is transparent (implicit in mixed mode)

and inside the object the box attribute is set, then the

object is surrounded by video. If the box attribute is not set

the background colour inside the object will also be

displayed as transparent.

A B C D E F

Fig.18 Cursor Display

Plane

Colour Allocation

0 0

Background Colour

0 1

Foreground Colour

1 0

CLUT entry 6

1 1

CLUT entry 7

Table 16 Special Character Colour allocation

VOLUME

Background Colour

Foreground Colour 7

Background Colour

Serial Attribute

“set at” (Mode 0)

Background Colour

“set after” (Mode 1)

Foreground Colour

Normal Character

Foreground Colour 6

Special Character

Fig.19 Special Character Example

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