TDA9351PS/N2 View Datasheet(PDF) - Philips Electronics
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TDA9351PS/N2 Datasheet PDF : 118 Pages
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Philips Semiconductors
TV signal processor-Teletext decoder with
embedded µ-Controller
Tentative Device Specification
TDA935X/6X/8X PS/N2 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 Memory
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Text Area
ROW
Display
0
possible
1
2
3
4
5
Soft Scrolling 6
display possible 7
8
9
10
11
12
Display
13
possible
14
15
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.
b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
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
Fig.20 Display Map and Data Pointers
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.
2001 Jan 18
50
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