p87c770aar NXP Semiconductors, p87c770aar Datasheet - Page 44

• Manufacturer Part Number: p87c770aar
• Description: Microcontrollers Ntsc With On-screen Display Closed Caption
• Manufacturer: NXP Semiconductors

Philips Semiconductors
18.4
A number of 8-bit registers are provided which are used to
select various parameters for the whole screen.
18.4.1
When superimpose or boxing are set, the resulting display
depends on the setting of the screen display mode bits.
The mode is selected by the MOD0 and MOD1 bits of the
Display Control Register (see Section 18.9.1).
Table 56 Selection of screen display modes
18.4.2
18.4.2.1
Fringing can be set to work in any direction (N, S, E and
W). The direction is selected by setting one of the four
FRDx bits in the Fringing Control Register (see
Section 18.9.4). Where x = N, S, E or W and N = North,
S = South etc.
Table 57 Selection of Fringing direction
1999 Jun 11
Video mode: disables all display activities and sets the
RGB to true black and FBL to video.
Full Text mode: displays screen colour at all locations
not covered by character foreground or background
colour. The box attribute has no effect.
Mixed Screen mode: displays screen colour at all
locations not covered by character foreground or, within
boxed areas, background colour.
Mixed Video mode: displays video at all locations not
covered by character foreground or within boxed areas,
background colour.
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
MOD1
0
0
1
1
Screen controls
D
F
RINGING CONTROLS
ISPLAY MODES
Fringing direction
FRDx
0
1
MOD0
0
1
0
1
Video mode
Full Text mode
Mixed Screen mode
Mixed Video mode
FRINGING DIRECTION
DISPLAY MODE
on
off
44
18.4.3
The colour of the fringe is set by the FRC0 to FRC3 bits in
the Fringing Control Register (see Section 18.9.4).
Any one of 16 colours can be selected.
Table 58 Fringing colour
18.4.4
The screen colour can be any one of 16 colours.The colour
is selected using the SRC0 to SRC3 bits in the Display
Control Register (see Section 18.9.1).The screen colour
covers the full video width, as described in Section 18.7.1.
It is visible when the Text mode is set and no foreground
or background pixels are being displayed (see
Section 18.4.1).
Table 59 Selection of the screen colour
18.4.5
The flash frequency is set by the FLF bit in the Display
Control Register; (see Section 18.9.1).
Table 60 Selection of the flash frequency
3
0
1
3
0
1
FLF
0
1
FRC<3-0>
SRC<3-0>
F
S
F
2
0
1
2
0
1
RINGING COLOUR
LASH FREQUENCY
CREEN COLOUR
approximately 1 Hz with a 50% active ratio
approximately 2 Hz with a 50% active ratio
1
0
1
1
0
1
0
0
1
0
0
1
FLASH FREQUENCY
P8xCx70 family
FRINGING COLOUR
SCREEN COLOUR
Product specification
Colour 15
Colour 15
Colour 0
Colour 0