參數(shù)資料
型號(hào)： SAA5522PS
廠商： NXP Semiconductors N.V.
英文描述： Standard TV Microcontrollers with On-Screen Display(OSD)
中文描述： 微控制器與標(biāo)準(zhǔn)電視屏幕顯示（OSD）
文件頁數(shù)： 61/80頁
文件大?。?/td> 340K
代理商： SAA5522PS
1999 Oct 27
61
Philips Semiconductors
Preliminary specification
Standard TV microcontrollers with
On-Screen Display (OSD)
SAA55xx
19.8.1
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 18
Screen colour display area
19.8.2
T
EXT DISPLAY AREA
The text area can be defined to start with an offset in both
the horizontal and vertical direction.
Table 19
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 width of the text area is defined in the MMR Text Area
End by setting the end character value TAE<5:0>. This
number determines where the background colour of the
textareawillendifsettoextendtotheendoftherow.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
Register. 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.
19.9
Character set
A set can consist of alphanumeric characters as required
by WST Teletext or customer definable OSD characters.
Two character sets can be displayed at once. These are
the basic G0 set or the alternate G2 set (Twist Set).
The basic set is selected using TXT18.BS<1:0>.
The alternate/twist character set is defined by
TXT19.TS<1:0>. Since the alternate character set is an
option it can be enabled or disabled using TXT19.TEN,
and the language code that is defined for the alternate set
is defined by TXT19.TC<2:0>.
19.10 Display synchronization
The horizontal and vertical synchronizing signals from the
TV deflection are used as inputs. Both signals can be
inverted before being delivered to the Phase Selector
section.
SFRs bits TXT1.HPOLARITY and TXT1.VPOLARITY
control the polarity.
Alinelocked12 MHzclockisderivedfromthe12 MHzfree
running oscillator by the Phase Selector. This line locked
clock is used to clock the whole of the Display block.
The horizontal and vertical sync signals are synchronized
with the 12 MHz clock before being used in the Display
section.
19.11 Video/data switch (fast blanking) polarity
The polarity of the Video/data (fast blanking) signal can be
inverted. The polarity is set with the VDSPOL bit in the
MMR RGB Brightness.
Table 20
Fast blanking signal polarity
VECTOR
DESCRIPTION
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
VECTOR
DESCRIPTION
Horizontal
Up to 40 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
VDSPOL
0
0
1
1
VDS
1
0
0
1
CONDITION
RGB display
Video display
RGB display
Video display
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