saa5547ps NXP Semiconductors, saa5547ps Datasheet - Page 49
saa5547ps
Manufacturer Part Number
saa5547ps
Description
Saa550x; Saa554x Tv Microcontrollers With Closed Captioning Cc And On-screen Display Osd
Manufacturer
NXP Semiconductors
Datasheet
1.SAA5547PS.pdf
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Philips Semiconductors
18.3.15 S
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.
2000 Feb 23
handbook, full pagewidth
TV microcontrollers with Closed Captioning (CC)
and On-Screen Display (OSD)
This example could also be done with 8 special characters.
PECIAL GRAPHICS CHARACTERS
background colour
background colour
"set at" (Mode 0)
foreground colour 7
Fig.21 Special character example.
VOLUME
serial attribute
special character
foreground colour
normal character
49
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
"set after" (Mode 1)
background colour
foreground colour 6
PLANE 0
0
1
0
1
MGK550
background colour
foreground colour
CLUT entry 6
CLUT entry 7
COLOUR ALLOCATION
Preliminary specification
SAA55xx
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