參數(shù)資料
型號(hào)： SAA5647HL
廠商： NXP Semiconductors N.V.
英文描述： Enhanced TV microcontrollers with On-Screen Display (OSD)(帶全屏顯示的增強(qiáng)型TV控制器)
中文描述： 與微控制器在強(qiáng)化電視屏幕顯示（OSD）（帶全屏顯示的增強(qiáng)型電視控制器）
文件頁(yè)數(shù)： 82/112頁(yè)
文件大?。?/td> 436K
代理商： SAA5647HL
2000 Jun 30
82
Philips Semiconductors
Objective specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA56xx
23.6
Screen and global controls
A number of attributes are available that affect the whole
display region of a display window, and cannot be applied
selectively to regions of the display.
23.6.1
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 10,
13 or 16 per display row. The number of TV scan lines per
row is defined by TXT21.DISP LINES<1:0>.
A value of nine lines per row can be achieved if the display
is forced into 525-line display mode by
TXT17.FORCE DISP<1:0>, or if the device is in 10-line
mode and the automatic detection circuit within display
finds 525-line display syncs.
The number of TV lines per row is then set for both the
display windows in double window mode.
23.6.2
C
HARACTER MATRIX
(H
×
V)
There are three different character matrices available:
12
×
10, 12
×
13 and 12
×
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, the matrix is padded with blank lines. If the
character matrix is greater than the number of TV scan
lines, the character is truncated.
The character matrix is set for all display windows.
23.6.3
D
ISPLAY MODES
CC:
When the superimpose or boxing attribute (see
Table 32, Serial Mode 0/1, bit 6) is set, the resulting
display depends on the setting of the following screen
control mode bits in the MMR Display Control
(see Table 33):
TXT:
The display mode is controlled by the bits in the
TXT5 and TXT6 in single window mode or for Page A in
double window mode, and by the bits in bytes TXT24 and
TXT25 in Page B in double window mode. There are three
control functions: Text on, Background on and Picture on
(see Table 34). Separate sets of bits are used inside and
outside Teletext boxes so that different display modes can
be invoked. Bit(s) TXT6 and/or TXT25 are used if the
newsflash (C5) or subtitle (C6) bits in row 25 of the basic
page memory are set; otherwise, byte TXT5 and/or TXT24
is/are 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.
When Teletext box control characters are present in the
display page memory, the appropriate Box control bit must
be set, TXT<n>.Box ON 0 (B),
TXT<n>.Box ON Row 1
23 (B), TXT<n>.Box ON 24 (B)
where <n> is:
7 in single page mode or for Page A in double window
mode
26 for double window mode for Page B.
This allows the display mode to be different inside the
Teletext box compared to outside. These control bits are
present to allow boxes in certain areas of the screen to be
disabled. The use of Teletext boxes for OSD messages
has been superseded in this device by the OSD box
concept. However, these bits remain to allow Teletext
boxes to be used, if required.
Table 33
Selection of display modes
MOD1
MOD0
DISPLAY MODE
DESCRIPTION
0
0
0
1
Video
Full Text
Disables all display activities, sets the RGB to true black and VDS to video.
Displays screen colour at all locations not covered by character foreground
or background colour. The box attribute has no effect.
Mixed Screen Colour Displays screen colour at all locations not covered by character foreground,
within boxed areas or, background colour.
Mixed Video
Displays video at all locations not covered by character foreground, within
boxed areas or, background colour.
1
0
1
1
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