參數(shù)資料
型號(hào)： SAA55XX
廠商： NXP Semiconductors N.V.
英文描述： TV microcontrollers with Closed Captioning (CC) and On-Screen Display (OSD)
中文描述： 與隱藏字幕（CC）和屏幕顯示（OSD電視微控制器）
文件頁(yè)數(shù)： 47/84頁(yè)
文件大?。?/td> 352K
代理商： SAA55XX
2000 Feb 23
47
Philips Semiconductors
Preliminary specification
TV microcontrollers with Closed Captioning (CC)
and On-Screen Display (OSD)
SAA55xx
18.3.9
U
NDERLINE
The underline attribute causes the characters to have the
bottom scan line of the character cell forced to foreground
colour, including spaces. If background duration is set,
then underline is set until the end of the text area.
CC:
The underline attribute (see Table 16, Serial Mode
0/1, bit 4) is valid from the time set until the end of row or
otherwise modified.
TXT:
This attribute is not available.
18.3.10 O
VERLINE
The overline attribute causes the characters to have the
top scan line of the character cell forced to foreground
colour, including spaces. If background duration is set,
then overline is set until the end of the text area.
CC:
The overline attribute (see Table 16, Serial Mode 0/1,
bit 5) is valid from the time set until end of row or otherwise
modified. Overlining of italic characters is not possible.
TXT:
This attribute is not available.
18.3.11 E
ND OF ROW
CC:
The number of characters in a row is flexible and can
be determined by the end of row attribute (see Table 16,
Serial Mode 1, bit 9). However, the maximum number of
character positions displayed is determined by the setting
of the MMR Text Position Horizontal and MMR Text Area
End.
Note that when using the end of row attribute the next
character location after the attribute should always be
occupied by a ‘space’.
TXT:
This attribute is not available, row length is fixed at
40 characters.
18.3.12 F
RINGING
A fringe (shadow) can be defined around characters. The
fringe direction is individually selectable in any of the
North, South, East and West direction using the MMR
Fringing Control. The colour of the fringe can also be
defined as one of the entries in the CLUT, again using
MMR Fringing Control. An example of south and
south-west fringing is shown in Fig.18.
CC:
The fringe attribute (see Table 16, Serial Mode 0,
bit 9) is valid from the time set until the end of the row or
otherwise modified.
TXT:
The display of fringing in TXT mode is controlled by
the TXT4.SHADOW ENABLE bit.
Whenset,allthealphanumericcharactersbeingdisplayed
are shadowed, graphics characters are not shadowed.
18.3.13 M
ESHING
The attribute effects the background colour being
displayed. Alternate pixels are displayed as the
background colour or video.The structure is offset by
1 pixel from scan line to scan line, thus achieving a
checker board display of the background colour and video.
An example of meshing is shown in Fig.19.
CC:
The setting of the MSH bit in MMR Display Control
has the effect of meshing any background colour.
TXT:
There are two meshing attributes one that only
affects black background colours TXT4.B MESH ENABLE
and a second that only affects backgrounds other than
black TXT4.C MESH ENABLE. A black background is
defined as CLUT entry 8, a non-black background is
defined as CLUT entry 9 to 15.
18.3.14 C
URSOR
The cursor operates by reversing the background and
foreground colours in the character position pointed to by
the active cursor position. The cursor is enabled using
TXT7.CURSOR ON. When active, the row the cursor
appears on is defined by TXT9.R<4:0> and the column is
defined by TXT10.C<5:0>. The position of the cursor can
be fixed using TXT9.CURSOR FREEZE. The cursor
display is shown in Fig.20.
CC:
The valid range for row is 0 to 15. The valid range for
column is 0 to 47. The cursor remains rectangular at all
times, its shape is not affected by italic attribute, therefore
it is not advised to use the cursor with italic characters.
TXT:
The valid range for row positioning is 0 to 24.
The valid range for column is 0 to 39.
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