saa569x NXP Semiconductors, saa569x Datasheet - Page 73

• Manufacturer Part Number: saa569x
• Description: Enhanced Tv Microcontrollers With On-screen Display Osd
• Manufacturer: NXP Semiconductors

Philips Semiconductors
23.5
All display features are now described in detail for both
TXT and CC modes.
23.5.1
Flashing causes the foreground colour pixels to be
displayed as the background pixels. The flash frequency is
controlled by software setting and resetting the MMR
Status (see Table 43) at the appropriate interval.
CC: This attribute is valid from the time set (see Table 35)
until the end of the row of a display window, or until
otherwise modified.
TXT: This attribute is set by the control character ‘flash’
(08H) (see Fig.39) and remains valid until the end of a row
of a display window, or until reset by the control character
‘steady’ (09H).
23.5.2
CC: This attribute is valid from the time set until the end of
a row of a display window, or otherwise modified if set with
Serial Mode 0. If set with Serial Mode 1, then it is set from
the next character onwards.
In text mode (within CC mode), the background colour is
displayed regardless of the setting of the box attribute bit.
Boxes take effect only during mixed mode. Where boxes
are set in this mode, the background colour is displayed.
Character locations where boxes are not set show
video/screen colour (depending on the setting in the MMR
Display Control) instead of the background colour.
TXT: Two types of boxes exist: the Teletext box and the
OSD box. The Teletext box is activated by the ‘start box’
control character (0BH), Two start box characters are
required to begin a Teletext box, with the box starting
between the two characters. The box ends at the end of
the line or after an ‘end box’ control character.
TXT mode can also use OSD boxes, which are started
using size implying OSD control characters
(BCH/BDH/BEH/BFH). The box starts after the control
character (set after) and ends either at the end of a row of
a display window, or at the next size implying OSD
character (set at).
The attributes flash, Teletext box, conceal, separate
graphics, twist and hold graphics are all reset at the start
of an OSD box, as they are at the start of the row.
OSD boxes are only valid in TV mode, which is defined by
TXT5 = 03H and TXT6 = 03H.
2002 May 06
Enhanced TV microcontrollers with
On-Screen Display (OSD)
Display feature descriptions
F
B
LASH
OXES
73
23.5.3
The size of the characters can be modified in both the
horizontal and vertical directions.
CC: Two sizes are available in both the horizontal and
vertical directions. The sizes available are normal ( 1),
double ( 2) height/width and any combination of these.
The attribute setting is always valid for the whole row of a
display window. Mixing of sizes within a row is not
possible.
TXT: Three horizontal sizes are available: normal ( 1),
double ( 2), quadruple ( 4). The control characters
‘normal size’ (0CH/BCH) enable normal size. The ‘double
width’ or double size (0EH/BEH/0FH/BFH) control
characters enable double width characters.
Any two consecutive combinations of ‘double width’ or
‘double size’ (0EH/BEH/0FH/BFH) control characters
activate quadruple width characters, provided quadruple
width characters are enabled by TXT4.QUAD WIDTH
ENABLE.
Three vertical sizes are available normal ( 1), double ( 2)
and quadruple ( 4). The control characters ‘normal size’
(0CH/BCH) enable normal size, the ‘double height’ or
‘double size’ (0DH/BDH/0FH/BFH) enable double height
characters. Quadruple height characters are achieved by
using double height characters and setting the global
attributes TXT7.DOUBLE HEIGHT (expand) and
TXT7.BOTTOM/TOP.
If double height characters are used in Teletext mode,
single height characters in the lower row of the double
height character are automatically disabled.
23.5.4
CC: This attribute is valid from the time set until the end of
a row of a display window, or otherwise modified. The
attribute causes the character foreground pixels to be
offset horizontally by 1 pixel per 4 scan lines (interlaced
mode). The base is the bottom left character matrix pixel.
The pattern of the character is indented, as shown in
Fig.31.
TXT: The Italic attribute is not available.
S
I
TALIC
IZE
SAA567x; SAA569x
Objective specification