參數(shù)資料
型號： 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）
文件頁數(shù)： 60/84頁
文件大小： 352K
代理商： SAA55XX
2000 Feb 23
60
Philips Semiconductors
Preliminary specification
TV microcontrollers with Closed Captioning (CC)
and On-Screen Display (OSD)
SAA55xx
18.7.1
S
CREEN COLOUR DISPLAY AREA
This area is covered by the screen colour. The screen
colour display area starts with a fixed offset of 8
μ
s from
the leading edge of the horizontal sync pulse in the
horizontal direction. A vertical offset is not necessary.
Table 20
Screen colour display area
18.7.2
T
EXT DISPLAY AREA
The text area can be defined to start with an offset in both
the horizontal and vertical direction.
Table 21
Text display area
The horizontal offset is set in the MMR 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 value 09H should also be avoided in the MMR Text
Area Start as corruption of the row 24 display can occur.
Alternative values are C8H or 49H to overcome this
problem.
The width of the text area is defined in the MMR Text Area
End Register 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 Text Position Vertical.
The offset value VOL<5:0> is done in number of TV scan
lines.
Note that the Text Position Vertical Register should not be
set to 00H as the Display Busy interrupt is not generated
in these circumstances.
18.8
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.
18.8.1
C
HARACTER MATRICES
The character matrices that can be accommodated in both
display modes are:
(H
×
V
×
planes) 12
×
9
×
1, 12
×
10
×
1, 12
×
13
×
1,
12
×
16
×
1.
These modes allow two colours per character position.
In CC mode two additional character matrices are
available to allow four colours per character.
(H
×
V
×
planes) 12
×
13
×
2, 12
×
16
×
2.
The characters are stored physically in ROM in a matrix of
size either 12
×
10 or 12
×
16.
POSITION
525-LINE
Horizontal
Start at 8
μ
s after leading edge of
horizontal sync for 56
μ
s.
Line 9, Field 1 (321, Field 2) to leading
edge of vertical sync (line numbering
using 625 standard).
Vertical
POSITION
DESCRIPTION
Horizontal
Up to 48 full sized characters per row.
Start position setting from 8 to 64
characters from the leading edge of
horizontal sync. Fine adjustment in
quarter characters.
256 lines (nominal 41 to 297). Start
position setting from leading edge of
vertical sync, legal values are
4 to 64 lines (line numbering using
625 standard).
Vertical
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