參數(shù)資料
型號(hào)： SAA6712E
廠商： NXP SEMICONDUCTORS
元件分類： 數(shù)學(xué)處理器
英文描述： ECONOLINE: RB & RA - Dual Output from a Single Input Rail- Power Sharing on Output- Industry Standard Pinout- 1kVDC & 2kVDC Isolation- Custom Solutions Available- UL94V-0 Package Material- Efficiency to 85%
中文描述： GRAPHICS PROCESSOR, PBGA292
封裝： 27 X 27 MM, 1.75 MM HEIGHT, PLASTIC, SOT-489-1, BGA-292
文件頁(yè)數(shù)： 50/64頁(yè)
文件大小： 228K
代理商： SAA6712E
1999 Aug 25
50
Philips Semiconductors
Preliminary specification
XGA RGB to TFT graphics engine
SAA6712E
8.10
On screen display
8.10.1
OSD
GENERALS
The implemented OSD is a character based window
system. It consists of a character matrix memory where all
character definitions are stored, and an OSD window
memory defining the OSD window’s contents. The OSD
window will be inserted into the video data stream if
osd_active is set to logic 1. Writing to these memories can
be done during data processing.
8.10.2
OSD
WINDOW
The OSD window contains the character, colour and
appearance information to be displayed. Such a definition
existsforeachcharacter position.Acharactercanuseone
of8 differentforegroundandbackgroundcolours.Someof
thesecolourscanbedefinedastransparentcolourswhere
the original picture information will be displayed instead,
as alpha blended colours where a 1 : 1 or 1 : 2 alpha
blending will be done between picture and OSD, or as
normal colours. Transparency or alpha blending effects
will be enabled or disabled for the single characters.
The size and outline of the visible OSD window can be
programmed as long as the internal memory meets the
needs. This memory is able to store information of
1152 characters information.
The programming registers osd_v_size and osd_h_size
define the OSD window size in characters. The window
position inside the output frame must be defined with
osd_v_offset and osd_h_offset (see Fig.15).
The OSD can be programmed to use a 24
×
24 character
matrix,ora12
×
16matrix.Thefirstoneshouldbeusedfor
Kanji and the second for standard characters.
The selection of the font size is done by char_size.
A logic 1 selects 24
×
24 font, and a logic 0 the smaller
12
×
16 font. If the small 12
×
16 font is used, up to
128 different characters can bedefined. Alternatively up to
42 characters of the larger 24
×
24 font can be used.
Table 12 gives some possible OSD settings.
Fig.15 OSD window positioning.
MHB260
handbook, halfpage
OUTPUT FRAME
OSD
osd_h_offset
osd_v_offset
osd_v_size
osd_h_size
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