TDA9554PS datasheet(44/125 Pages) PHILIPS

44 / 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

Display Feature Descriptions

FLASH

Flashing causes the foreground colour pixel to be

displayed as the background pixels.The flash frequency is

controlled by software setting and resetting display

CC: This attribute is valid from the time set (see Table 18)

until the end of the row or until otherwise modified.

TXT: This attribute is set by the control character ‘flash’

(08h) and remains valid until the end of the row or until

reset by the control character ‘steady’ (09h).

BOXES

CC: This attribute is valid from the time set until end of row

or otherwise modified if set with Serial Mode 0. If set with

Serial Mode 1, then it is set from the next character

onwards.

In CC text mode the background colour is displayed

regardless of the setting of the box attribute bit. Boxes take

affect only during mixed mode, where boxes are set in this

mode the background colour is displayed. Character

locations where boxes are not set show video/screen

colour (depending on the setting in the display control

background colour.

TXT: Two types of boxes exist the Teletext box and the

OSD box. The Teletext box is activated by the ‘start box’

control character (0Bh), Two start box characters are

required begin a Teletext box, with box starting between

the 2 characters. The box ends at the end of the line or

after a ‘end box’ control character.

TXT mode can also use OSD boxes, they are started using

size implying OSD control chracters(BCh/BDh/BEh/BFh).

The box starts after the control character (‘set after’) and

ends either at the end of the row or at the next size

implying OSD character (‘set at’). The attributes flash,

teletext box, conceal, separate graphics, twist and hold

graphics are all reset at the start of an OSD box, as they

are at the start of the row. OSD Boxes are only valid in TV

mode which is defined by TXT5=03h and TXT6=03h.

SIZE

The size of the characters can be modified in both the

horizontal and vertical directions.

CC: Two sizes are available in both the horizontal and

vertical directions. The sizes available are normal (x1),

double (x2) height/width and any combination of these.

The attribute setting is always valid for the whole row.

Mixing of sizes within a row is not possible.

TXT: Three horizontal sizes are available

normal(x1),double(x2),quadruple(x4). The control

characters ‘normal size’ (0Ch/BCh) enables normal size,

the ‘double width’ or double size (0Eh/BEh/0Fh/BFh)

enables double width characters. Any two consecutive

combination of ‘double width’ or ‘double size’

(0Eh/BEh/0Fh/Bfh) activates quadruple width characters,

provided quadruple width characters are enabled by

TXT4.Quad Width Enable. Three vertical sizes are

available normal(x1),double(x2),quadruple(x4). The

control characters ‘normal size’ (0Ch/BCh) enable normal

size, the ‘double height’ or ‘double size’

(0Dh/BDh/0Fh/BFh) enable double height characters.

Quadruple height character are achieved by using double

height characters and setting the global attributes

TXT7.Double Height(expand) and TXT7.Bottom/Top.

If double height characters are used in teletext mode,

single height characters in the lower row of the double

height character are automatically disabled.

ITALIC

CC: This attribute is valid from the time set until the end of

the row or otherwise modified. The attribute causes the

character foreground pixels to be offset horizontally by 1

pixel per 4 scan lines (interlaced mode). The base is the

bottom left character matrix pixel. The pattern of the

character is indented as shown in Fig.15.

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