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)： 46/84頁
文件大?。?/td> 352K
代理商： SAA55XX
2000 Feb 23
46
Philips Semiconductors
Preliminary specification
TV microcontrollers with Closed Captioning (CC)
and On-Screen Display (OSD)
SAA55xx
18.3.5
C
OLOURS
A CLUT (Colour Look-Up Table) with 16 colour entries is
provided. The colours are programmable out of a palette
of 4096 (4 bits per R, G and B). The CLUT is defined by
writing data to a RAM that resides in the MOVX address
space of the 80C51.
Table 11
CLUT colour values
18.3.6
F
OREGROUND
C
OLOUR
CC:
The foreground colour can be chosen from 8 colours
on a character-by-character basis. Two sets of 8 colours
are provided. A serial attribute switches between the
banks(seeTable 16,SerialMode 1,bit7).Thecoloursare
the CLUT entries 0 to 7 or 8 to 15.
TXT:
The foreground colour is selected via a control
character (see Table 16). The colour control characters
take effect at the start of the next character (set-after) and
remain valid until the end of the row, or until modified by a
control character. Only 8 foreground colours are available.
The text foreground control characters map to the CLUT
entries is shown in Table 12.
Table 12
Foreground CLUT mapping
18.3.7
B
ACKGROUND COLOUR
CC:
This attribute is valid from the time set until end of row
or otherwise modified if set with Serial Mode 0. If set with
Serial Mode 1, then the colour is set from the next
character onwards.
The background colour can be chosen from all 16 CLUT
entries.
TXT:
The control character ‘new background’ (1DH) is
used to change the background colour to the current
foreground colour. The selection is immediate (set at) and
remains valid until the end of the row or until otherwise
modified.
The Text background control characters map to the CLUT
entries as shown in Table 13.
Table 13
Background CLUT mapping
18.3.8
B
ACKGROUND DURATION
The attribute when set takes effect from the current
positionuntiltheendofthetextdisplaydefinedintheMMR
Text Area End.
CC:
The background duration attribute (see Table 16,
Serial Mode 1, bit 8) in combination with the End Of Row
attribute (see Table 16, Serial Mode 1, bit 9) forces the
background colour to be displayed on the row until the end
of the text area is reached.
TXT:
This attribute is not available.
RED<3:0>
(B11 TO B8)
0000
0000
....
1111
1111
GREEN<3:0
>(B7 TO B4)
0000
0000
....
1111
1111
BLUE<3:0>
(B3 TO B0)
0000
1111
....
0000
1111
COLOUR
ENTRY
0
1
....
14
15
CONTROL
CODE
00H
01H
02H
03H
04H
05H
06H
07H
DEFINED
COLOUR
black
red
green
yellow
blue
magenta
cyan
white
CLUT ENTRY
0
1
2
3
4
5
6
7
CONTROL
CODE
00H + 1DH
01H + 1DH
02H + 1DH
03H + 1DH
04H + 1DH
05H + 1DH
06H + 1DH
07H + 1DH
DEFINED
COLOUR
black
red
green
yellow
blue
magenta
cyan
white
CLUT ENTRY
8
9
10
11
12
13
14
15
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