TDA9554PS datasheet(52/125 Pages) PHILIPS

52 / 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

Screen Colour

Screen colour is displayed from 10.5 ms to 62.5 ms after

the active edge of the HSync input and on TV lines 23 to

310 inclusive, for a 625 line display, and lines 17 to 260

inclusive for a 525 line display.

The screen colour is defined by REG0:Display Control and

points to a location in the CLUT table. The screen colour

covers the full video width. It is visible when the Full Text

or Mixed Screen Colour mode is set and no foreground or

background pixels are being displayed.

Text Display Controls

TEXT DISPLAY CONFIGURATION

Two types of area are possible. The one area is static and

the other is dynamic. The dynamic area allows scrolling of

a region to take place. The areas cannot cross each other.

Only one scroll region is possible.

Display Map

The display map allows a flexible allocation of data in the

memory to individual rows.

Sixteen words are provided in the display memory for this

purpose. The lower 10 bits address the first word in the

memory where the row data starts. This value is an offset

in terms of 16-bit words from the start of Display Memory

(8000 Hex). The most significant bit enables the display

when not within the scroll (dynamic) area.

The display map memory is fixed at the first 16 words in

the closed caption display memory.

SOFT SCROLL ACTION

The dynamic scroll region is defined by the REG5:Scroll

Area, REG6:Scroll Range, REG14:Top Scroll line and the

REG8:Status Register. The scroll area is enabled when

the SCON bit is set in REG8: Status.

The position of the soft scroll area window is defined using

the Soft Scroll Position (SSP<3:0), and the height of the

window is defined using the Soft Scroll Height (SSH<3:0>)

both are in REG6:Scroll Range. The rows that are scrolled

through the window are defined using the Start Scroll Row

(STS<3:0>) and the Stop Scroll Row (SPS<3:0>) both are

in REG5:Scroll Area.

The soft scrolling function is done by modifying the Scroll

Line (SCL<3:0>) in REG14: Top Scroll Line. and the first

scroll row value SCR<3:0> in REG8:Status. If the number

of rows allocated to the scroll counter is larger than the

defined visible scroll area, this allows parts of rows at the

top and bottom to be displayed during the scroll function.

The registers can be written throughout the field and the

values are updated for display with the next field sync.

Care should be taken that the register pairs are written to

by the software in the same field.

Only a region that contains only single height rows or only

double height rows can be scrolled.

b11 b10

Pointer to Row Data

Reserved, should be set to 0

Text Display Enable, valid outside Soft Scroll Area

0 = Disable

1 = Enable

Table 21 Display map Bit Allocation

Display Memory

Text Area

ROW

Display

possible

Display

possible

Soft Scrolling

display possible

Fig.21 Display Map and Data Pointers

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