參數(shù)資料
型號: TDA938X
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): 73/140頁
文件大小: 570K
代理商: TDA938X
Philips Semiconductors
Preliminary specification
1999 Sep 28
73
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA 935X/6X/8X series
S
OFT
S
CROLL
A
CTION
The dynamic scroll region is defined by the following MMRs: 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
MMR 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 the MMR 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 the MMR REG5:Scroll Area.
The soft scrolling function is done by modifying the Scroll Line (SCL<3:0>) in MMR REG14: Top Scroll Line. and
the first scroll row value SCR<3:0> in MMR 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.
Figure 33 Soft Scroll Area
ROW
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Soft Scroll Position
Pointer SSP<3:0> e.g. 6
Soft Scroll Height
SSH<3:0> e.g.4
Start Scroll Row
STS<3:0> e.g. 3
Stop Scroll Row
SPS<3:0> e.g. 11
Usable for OSD Display
Should not be used for
OSD Display
Should not be used for
OSD Display
Usable for OSD Display
Soft Scrolling Area
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