參數(shù)資料
型號(hào)： SAA567X
廠商： NXP Semiconductors N.V.
英文描述： Enhanced TV microcontrollers with On-Screen Display (OSD)
中文描述： 與微控制器在強(qiáng)化電視屏幕顯示（OSD）
文件頁(yè)數(shù)： 82/116頁(yè)
文件大小： 532K
代理商： SAA567X
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2002 May 06
82
Philips Semiconductors
Objective specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA567x; SAA569x
23.5.19
CONTRAST REDUCTION
The device can act on the TV’s display circuit to reduce
contrast of the video by driving the COR output LOW.
Contrast reduction improves the readability of characters
in mixed mode.
TXT:
Bits COR IN in SFRs TXT5 and TXT6 control when
theCORoutputofthedeviceisactivated.Thesebitsallow,
for example, the display to be set-up so that the areas
inside Teletext boxes are contrast reduced when a subtitle
is displayed, leaving the rest of the screen displayed as in
normal conditions.
CC:
Here, the contrast reduction is controlled by the
contrastreductionattribute(seeTable 35).Thisattributeis
valid from the time set until the end of a row of a display
window, or otherwise modified if set with Serial Mode 0.
If set with Serial Mode 1, it is set from the next character
onwards.
23.6
Character and attribute coding
This section describes the character and attribute coding
for each mode.
23.6.1
CC
MODE
Character coding is split into character oriented attributes
(parallel, see Table 34) and character group coding
(serial, see Table 35). The serial attributes take effect
either at the position of the attribute (set at), or at the
following location (set after) and remain effective until
either modified by a new serial attribute or until the end of
a row of a display window. A serial attribute is represented
as a space (the space character itself however is not used
for this purpose). The attributes that are still active,
e.g. overline and underline, are visible during the display
of the space.
The default setting at the start of a row is:
1
×
size
Flash off
Overline off
Underline off
Italics off
Display mode = superimpose
Fringing off
Background colour duration = 0
End of row = 0.
The coding is done in 15-bit words. The codes are stored
sequentially in the Display memory. A maximum of
768 character positions can be defined for a single display.
23.6.2
TXT
MODE
Character coding is in a serial format, with only one
attribute being changed at any single location. The serial
attributes take effect either at the position of the attribute
(set at), or at the following location (set after). The attribute
remains effective until either modified by new serial
attributes or until the end of a row of a display window.
The default settings at the start of a row are:
Foreground colour white (CLUT address 7)
Background colour black (CLUT address 8)
Horizontal size
×
1, vertical size
×
1 (normal size)
Alphanumeric on
Contiguous Mosaic Graphics
Release Mosaics
Flash off
Box off
Conceal off
Twist off.
The attributes have individual codes which are defined in
the basic character table (see Fig.39).
23.6.3
P
ARALLEL CHARACTER CODING
Table 34
Parallel character coding
BITS
DESCRIPTION
0 to 7
8 to 10
11
12 to 13 character set selection; see Section 23.12.2
14
special graphics; see Section 23.5.17
8-bit character code
three bits for eight foreground colours
mode bit: 0 = parallel code
相關(guān)PDF資料
PDF描述
SAA5695HL Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA569x Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA5677HL Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA5700GP Chinese Character System Teletext CCST decoder
SAA5700 Chinese Character System Teletext CCST decoder
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA5695HL 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA5697HL 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA569X 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA5700 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Chinese Character System Teletext CCST decoder
SAA5700GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Chinese Character System Teletext CCST decoder
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