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)： 54/84頁(yè)
文件大?。?/td> 352K
代理商： SAA55XX
2000 Feb 23
54
Philips Semiconductors
Preliminary specification
TV microcontrollers with Closed Captioning (CC)
and On-Screen Display (OSD)
SAA55xx
Screen colour is displayed from 10.5 ms 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.
CC:
The screen colour is defined by the MMR Display
Control and points to a location in the CLUT table.
The screen colour covers the full video width. It is visible
when the Full Text or Mixed Screen Colour mode is set
and no foreground or background pixels are being
displayed.
TXT:
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.
18.6
Text display controls
18.6.1
T
EXT DISPLAY CONFIGURATION
(CC
MODE
)
Twotypesofareasarepossible.Theoneareaisstaticand
the other is dynamic. The dynamic area allows scrolling of
a region to take place. The areas cannot cross each other.
Only one scroll region is possible.
18.6.2
D
ISPLAY MAP
The display map allows a flexible allocation of data in the
memory to individual rows.
Sixteen words are provided in the display memory for this
purpose. The lower 10 bits address the first word in the
memory where the row data starts. This value is an offset
in terms of 16-bit words from the start of Display memory
(8000H). The most significant bit enables the display when
not within the scroll (dynamic) area.
The display map memory is fixed at the first 16 words in
the Closed Caption display memory.
Table 19
Display map bit allocation
BIT
FUNCTION
11
Text display enable, valid outside soft
scroll area. 0 = disable; 1 = enable.
This bit is reserved, should be set to
logic 0.
Pointer to row data.
10
9 to 0
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