SAA5531 Philips Semiconductors, SAA5531 Datasheet - Page 60

• Manufacturer Part Number: SAA5531
• Description: Enhanced TV microcontrollers with On-Screen Display OSD
• Manufacturer: Philips Semiconductors

Philips Semiconductors
19.3.5
A Colour Look-Up Table (CLUT) 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 17 CLUT colour values
2000 Feb 23
handbook, full pagewidth
(B11 TO B8)
RED<3:0>
Enhanced TV microcontrollers with
On-Screen Display (OSD)
0000
0000
1111
1111
...
10
11
12
13
14
15
C
0
1
3
4
5
7
8
9
2
6
OLOURS
0
2
Field 1
Field 2
> (B7 TO B4)
4
12
GREEN<3:0
6
16 character matrix
0000
0000
1111
1111
8 10 0 2 4 6 8 10
...
BLUE<3:0>
(B3 TO B0)
0000
1111
0000
1111
...
0 2 4 6 8 10 0 2 4 6 8 10
12
COLOUR
Fig.25 Italic characters.
ENTRY
13 character matrix
14
15
...
0
1
60
19.3.6
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 (see Table 22 Serial Mode 1, bit 7). The colours are
the CLUT entries 0 to 7 or 8 to 15.
TXT: The foreground colour is selected via a control
character (see Fig.29). The colour control characters takes
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 as shown in Table 18.
0 2 4 6 8 10 0 2 4 6 8 10
F
OREGROUND
12
10 character matrix
C
OLOUR
Preliminary specification
indented by 7/6/4
indented by 6/5/3
indented by 5/4/2
indented by 4/3/1
indented by 3/2/0
indented by 2/1
indented by 1/0
indented by 0
SAA55xx
MBK970