參數(shù)資料
型號： SAA5500PS/NNNN
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP52
封裝： 0.600 INCH, PLASTIC, SDIP-52
文件頁數(shù)： 54/80頁
文件大小： 340K
代理商： SAA5500PS/NNNN
1999 Oct 27
58
Philips Semiconductors
Preliminary specication
Standard TV microcontrollers with
On-Screen Display (OSD)
SAA55xx
19.5
Screen and global controls
A number of attributes are available that affect the whole
display region, and cannot be applied selectively to
regions of the display.
19.5.1
DISPLAY MODES
The display mode is controlled by the bits in the TXT5 and
TXT6. There are three control functions: Text on,
Background on and Picture on. Separate sets of bits are
used inside and outside teletext boxes so that different
display modes can be invoked. TXT6 is used if the
newsflash (C5) or subtitle (C6) bits in row 25 of the basic
page memory are set, otherwise TXT5 is 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, TXT7.BOX ON 0, TXT7.BOX ON 1
23 or
TXT7.BOX ON 24. This allows the display mode to be
different inside the Teletext box compared to outside.
These 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superseded in this device by the OSD box concept, but
these bits remain to allow teletext boxes to be used, if
required.
19.6
Screen colour
Screen colour is displayed from 10.5 to 62.5 ms after the
active edge of the HSYNC input and on TV lines 23 to 310
inclusive, for a 625-line display, and lines 17 to 260
inclusive for a 525-line display.
The register bits TXT17.SCREEN COL<2:0> can be used
to define a colour to be displayed in place of TV picture
and the black background colour. If the bits are all set to
zero, the screen colour is defined as ‘transparent’ and
TV picture and background colour are displayed as
normal. Otherwise the bits define CLUT entries 9 to 15.
19.7
Text display control
The display is organised as a fixed size of 25 rows
(0 to 24) of 40 columns (0 to 39), This is the standard size
for teletext transmissions. The control data in row 25 is not
displayed but is used to configure the display page
correctly.
Table 17 TXT display control bits
PICTURE ON
TEXT ON
BACKGROUND ON
EFFECT
0
X
Text mode, black screen
0
1
0
Text mode, background always black
0
1
Text mode
1
0
X
Video mode
1
0
Mixed text and TV mode
1
Text mode, TV picture outside text area
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