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參數(shù)資料
| 型號(hào)： | 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(hào)處理器與嵌入式米圖文電視解碼器控制器 |
| 文件頁(yè)數(shù)： | 76/140頁(yè) |
| 文件大小： | 570K |
| 代理商： | TDA935X |
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Philips Semiconductors
Preliminary specification
1999 Sep 28
76
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA 935X/6X/8X series
T
EXT
D
ISPLAY
A
REA
The text area can be defined to start with an offset in both the horizontal and vertical direction.
The horizontal offset is set in the MMR REG2: Text Area Start. The offset is done in full width characters using
TAS<5:0> and quarter characters using HOP<1:0> for fine setting. The values 00h to 08h for TAS<5:0> will
result in a corrupted display.
The width of the text area is defined in the MMR REG4:Text Area End by setting the end character value
TAE<5:0>. This number determines where the background colour of the Text Area will end if set to extend to
the end of the row. It will also terminate the character fetch process thus eliminating the necessity of a
row end
attribute. This entails however writing to all positions
The vertical offset is set in the MMR REG1:Text Position Vertical Register. The offset value VOL<5:0> is done
in number of TV scan lines.
Note: The Text Position Vertical register should not be set to 00H as the Display Busy interrupt is not generated
in these circumstances.
Character Set
To facilitate the global nature of the device the character set has the ability to accommodate a large number of
characters, which can be stored in different matrices
.
C
HARACTER
M
ATRICES
The character matrices that can be accommodated in both display modes are
(H x V x Planes) 12 x 9 x 1, 12 x 10 x 1, 12 x 13 x 1, 12 x 16 x 1. These modes allow two colours character
position.
In CC mode two additional character matrices are available to allow four colours per character
(H x V x Planes) 12 x 13 x 2, 12 x 16 x 2.
The characters are stored physically in ROM in a matrix of size either 12 x 10 or 12 x 16.
C
HARACTER
S
ET
S
ELECTION
Four character sets are available in the device. A set can consist of alphanumeric characters as required by the
WST Teletext or FCC Closed Captioning, Customer definable On-Screen Display characters, and Special
Graphic characters.
Horizontal
Up to 48 full sized characters per row.
Start position setting from 8 to 64 characters from the leading edge of H-
Sync. Fine adjustment in quarter characters.
Vertical
256 lines (nominal 41- 297).
Start position setting from leading edge of vertical sync, legal values are 4 to
64 lines.
(line numbering using 625 Standard)
Table 26 T
ext Display Area
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