參數(shù)資料
型號(hào)： TDA936X
廠商： NXP Semiconductors N.V.
英文描述： TV signal processor-Teletext decoder with embedded m-Controller
中文描述： 電視信號(hào)處理器與嵌入式米圖文電視解碼器控制器
文件頁數(shù)： 70/140頁
文件大?。?/td> 570K
代理商： TDA936X
Philips Semiconductors
Preliminary specification
1999 Sep 28
70
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA 935X/6X/8X series
TV
SCAN LINES PER
ROW
The number of TV scan lines per field used for each display row can be defined, the value is independent of the
character size being used. The number of lines can be either 10/13/16 per display row. The number of TV scan
lines per row is defined TXT21.DISP_LINES<1:0>.
A value of 9 lines per row can be achieved if the display is forced into 525 line display mode by
TXT17.DISP_FORCE<1:0>, or if the device is in 10 line mode and the automatic detection circuitry within
display finds 525 line display syncs.
C
HARACTER
M
ATRIX
(H
X
V)
There are three different character matrices available, these are 12 x 10, 12 x 13 and 12 x 16. The selection is
made using TXT21.CHAR_SIZE<1:0> and is independent of the number of display lines per row.
If the character matrix is less than the number of TV scan lines per row then the matrix is padded with blank
lines. If the character matrix is greater than the number of TV scan lines then the character is truncated.
D
ISPLAY
M
ODES
CC:- When attributes superimpose or boxing (see Table 21 Serial Mode 0/1, bit 6) are set, the resulting display
depends on the setting of the following screen control mode bits in the MMR REG0:Display Control.
TXT:- The display mode is controlled by the bits in the TXT5 and TXT6. There are 3 control functions - Text on,
Background on and Picture on. Separate sets of bits are used inside and outside Teletext boxes so that different
display modes can be invoked. TXT6 is used if the newsflash (C5) or subtitle (C6) bits in row 25 of the basic
page memory are set otherwise TXT5 is used. This allows the software to set up the type of display required on
newsflash and subtitle pages (e.g. text inside boxes, TV picture outside) this will be invoked without any further
software intervention when such a page is acquired
Display Mode
MOD
[1.0]
Description
Video
00
Video mode disables all display activities and sets the RGB
to true black and VDS to video.
Full Text
01
Full Text mode displays screen colour at all locations not
covered by character foreground or background colour. The
box attribute has no effect.
Mixed Screen Colour
10
Mixed Screen mode displays screen colour at all locations
not covered by character foreground, within boxed areas or,
background colour.
Mixed Video
11
Mixed Video mode displays video at all locations not covered
by character foreground, within boxed areas or, background
colour.
Table 22 Display Modes
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