參數(shù)資料
型號： SAA5647HL
廠商： NXP Semiconductors N.V.
英文描述： Enhanced TV microcontrollers with On-Screen Display (OSD)(帶全屏顯示的增強(qiáng)型TV控制器)
中文描述： 與微控制器在強(qiáng)化電視屏幕顯示（OSD）（帶全屏顯示的增強(qiáng)型電視控制器）
文件頁數(shù)： 66/112頁
文件大?。?/td> 436K
代理商： SAA5647HL
2000 Jun 30
66
Philips Semiconductors
Objective specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA56xx
23.1
Display features
Teletext and Enhanced OSD modes
Level 1.5 WST features
US Closed Caption features
50/60 Hz or 100/120 Hz display timing modes
Two page operation (50 Hz only)
Serial and parallel display attributes
Single/double/quadruple width and height for characters
Smoothing capability of double size, double width,
double height and quadruple size characters
Scrolling of display region
Variable flash rate controlled by software
Globally selectable scan lines per row 9/10/13/16
Globally selectable character matrix (H
×
V) 12
×
9,
12
×
10, 12
×
13, 12
×
16
Italics
Soft colours using CLUT with 4096 colour palette
Underline
Overline
Fringing (shadow) selectable from N-S-E-W direction
Fringe colour selectable
Meshing of defined area
Contrast reduction of defined area (both CC and
Teletext display modes
Cursor
Special graphics characters with two planes, allowing
four colours per character
64 software redefinable OSD characters
Up to 4 WST character sets (G0/G2) user
programmable in a single device (e.g. Latin, Cyrillic,
Greek and Arabic)
G1 Mosaic graphics, Limited G3 Line drawing
characters
WST character sets and Closed Caption character set
user programmable in a single device.
23.2
Display modes
The display section has two distinct modes with different
features available in each:
TXT:
This is the WST mode with additional serial and
global attributes. A TXT window is configured as a fixed
25 rows with 40 characters per row.
CC:
This is the US Closed Caption mode. A CC window
is configured as a maximum of 16 rows with a maximum
of 48 characters per row.
In both of the above modes, the character matrix and
TV lines per row can be defined. There is an option of a
character matrix (H
×
V) of 12
×
9, 12
×
10, 12
×
13, or
12
×
16, and 9, 10, 13 and 16 TV lines per display row.
Not all combinations of TV lines per row and maximum
display rows give a sensible OSD display, since there is a
limited number of TV scan lines available.
SFR TXT21 and memory mapped registers are used to
control the mode selection. The features will now be
described and their function in each of the modes given.
If the feature is different in either mode then this is stated.
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