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參數(shù)資料
| 型號： | TDA935X |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | TV signal processor-Teletext decoder with embedded m-Controller |
| 中文描述： | 電視信號處理器與嵌入式米圖文電視解碼器控制器 |
| 文件頁數(shù)： | 60/140頁 |
| 文件大小： | 570K |
| 代理商： | TDA935X |
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Philips Semiconductors
Preliminary specification
1999 Sep 28
60
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA 935X/6X/8X series
F
LASH
Flashing causes the foreground colour pixel to be displayed as the background pixels.The flash frequency is
controlled by software setting and resetting display register REG0: Status (see) at the appropriate interval.
CC:- This attribute is valid from the time set (see Table 21) until the end of the row or until otherwise modified.
TXT:- This attribute is set by the control character ‘flash’ (08h) (see Figure 31) and remains valid until the end
of the row or until reset by the control character ‘steady’ (09h).
B
OXES
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 text mode (within CC 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 register. REG0: Display Control) in stead of the 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’). To allow OSD boxes to be placed over teletext page 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.
S
IZE
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 is 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.
I
TALIC
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 Figure 26.
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