SAA5531 Philips Semiconductors, SAA5531 Datasheet - Page 64

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

Philips Semiconductors
19.4
This section describes the character and attribute coding
for each mode.
19.4.1
Character coding is split into character oriented attributes
(parallel) and character group coding (serial). The serial
attributes take effect either at the position of the attribute
(set at), or at the following location (set after) and remain
effective until either modified by a new serial attribute or
until the end of the row. A serial attribute is represented as
a space (the space character itself however is not used for
this purpose), the attributes that are still active,
e.g. overline and underline will be visible during the display
of the space.
The default setting at the start of a row is:
The coding is done in 12-bit words. The codes are stored
sequentially in the display memory. A maximum of
768 character positions can be defined for a single display.
2000 Feb 23
1 size
Flash off
Overline off
Underline off
Italics off
Display mode = superimpose
Fringing off
Background colour duration = 0
End of row = 0.
Enhanced TV microcontrollers with
On-Screen Display (OSD)
Character and attribute coding
CC
MODE
64
19.4.2
Character coding is in a serial format, with only one
attribute being changed at any single location. The serial
attributes take effect either at the position of the attribute
(set at), or at the following location (set after). The attribute
remains effective until either modified by new serial
attributes or until the end of the row.
The default settings at the start of a row are:
The attributes have individual codes which are defined in
the basic character table (see Fig.30).
19.4.3
Table 21 Parallel character coding
Foreground colour white (CLUT address 7)
Background colour black (CLUT address 8)
Horizontal size 1, vertical size 1 (normal size)
Alphanumeric on
Contiguous Mosaic Graphics
Release Mosaics
Flash off
Box off
Conceal off
Twist off.
8 to 10
0 to 7
BITS
11
TXT
P
ARALLEL CHARACTER CODING
MODE
8-bit character code
3 bits for 8 foreground colours
Mode bit: 0 = parallel code
DESCRIPTION
Preliminary specification
SAA55xx