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參數(shù)資料
| 型號： | 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） |
| 文件頁數(shù)： | 49/84頁 |
| 文件大?。?/td> | 352K |
| 代理商： | SAA55XX |
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2000 Feb 23
49
Philips Semiconductors
Preliminary specification
TV microcontrollers with Closed Captioning (CC)
and On-Screen Display (OSD)
SAA55xx
18.3.15 S
PECIAL GRAPHICS CHARACTERS
CC/TXT:
Several special characters are provided for
improved OSD effects. These characters provide a choice
of four colours within a character cell. The total number of
special graphics characters is limited to 16. They are
stored in the character codes 8XH and 9XH of the
character table (32 ROM characters), or in the DRCs
which overlay character codes 8XH and 9XH. Each
special graphics character uses two consecutive normal
characters.
Fringing, underline and overline is not possible for special
graphics characters. Special graphics characters are
activated when TXT20.OSD PLANES = 1.
Table 14
Special character colour allocation
If the screen colour is transparent (implicit in mixed mode)
and inside the object the box attribute is set, then the
object is surrounded by video. If the box attribute is not set
the background colour inside the object will also be
displayed as transparent.
PLANE 1
0
0
1
1
PLANE 0
0
1
0
1
COLOUR ALLOCATION
background colour
foreground colour
CLUT entry 6
CLUT entry 7
Fig.21 Special character example.
This example could also be done with 8 special characters.
handbook, full pagewidth
MGK550
VOLUME
background colour
"set at" (Mode 0)
background colour
"set after" (Mode 1)
serial attribute
foreground colour 7
background colour
special character
foreground colour
normal character
foreground colour 6
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