SAA5500PS Philips Semiconductors, SAA5500PS Datasheet - Page 54

• Manufacturer Part Number: SAA5500PS
• Description: Standard TV Microcontrollers with On-Screen Display(OSD)
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Table 15 Foreground CLUT mapping
19.3.6
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 16.
Table 16 Background CLUT mapping
1999 Oct 27
Standard TV microcontrollers with
On-Screen Display (OSD)
CONTROL
CONTROL
00H + 1DH
01H + 1DH
02H + 1DH
03H + 1DH
04H + 1DH
05H + 1DH
06H + 1DH
07H + 1DH
CODE
CODE
00H
01H
02H
03H
04H
05H
06H
07H
B
ACKGROUND COLOUR
DEFINED
COLOUR
DEFINED
COLOUR
magenta
magenta
yellow
yellow
green
green
black
white
black
white
cyan
cyan
blue
blue
red
red
CLUT ENTRY
CLUT ENTRY
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
54
19.3.7
The display of fringing is controlled by the TXT4.SHADOW
bit.
When set all the alphanumeric characters being displayed
are shadowed, graphics characters are not shadowed.
19.3.8
The attribute effects the background colour being
displayed. Alternate pixels are displayed as the
background colour or video. The structure is offset by
1 pixel from scan line to scan line, thus achieving a
checker board display of the background colour and video.
TXT: There are two meshing attributes one that only
affects black background colours TXT4.B MESH ENABLE
and a second that only affects backgrounds other than
black TXT4.C MESH ENABLE. A black background is
defined as CLUT entry 8, a non-black background is
defined as CLUT entry 9 to 15.
19.3.9
The cursor operates by reversing the background and
foreground colours in the character position pointed to by
the active cursor position. The cursor is enabled using
TXT7.CURSOR ON. When active, the row the cursor
appears on is defined by TXT9.R<4:0> and the column is
defined by TXT10.C<5:0>. The position of the cursor can
be fixed using TXT9.CURSOR FREEZE.
The valid range for row positioning is 0 to 24. The valid
range for column is 0 to 39.
F
M
C
RINGING
URSOR
ESHING
Preliminary specification
SAA55xx