參數(shù)資料
型號： P83C270AAR
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Microcontrollers for NTSC TVs with On-Screen Display OSD and Closed Caption CC
中文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PDIP52
文件頁數(shù)： 44/80頁
文件大小： 266K
代理商： P83C270AAR
1999 Jun 11
44
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
18.4
Screen controls
A number of 8-bit registers are provided which are used to
select various parameters for the whole screen.
18.4.1
D
ISPLAY MODES
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).
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.
Table 56
Selection of screen display modes
18.4.2
F
RINGING CONTROLS
18.4.2.1
Fringing direction
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
MOD1
MOD0
DISPLAY MODE
0
0
1
1
0
1
0
1
Video mode
Full Text mode
Mixed Screen mode
Mixed Video mode
FRDx
FRINGING DIRECTION
0
1
off
on
18.4.3
F
RINGING COLOUR
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
S
CREEN COLOUR
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
F
LASH FREQUENCY
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
FRC<3-0>
FRINGING COLOUR
3
2
1
0
0
↓
1
0
↓
1
0
↓
1
0
↓
1
Colour 0
↓
Colour 15
SRC<3-0>
SCREEN COLOUR
3
2
1
0
0
↓
1
0
↓
1
0
↓
1
0
↓
1
Colour 0
↓
Colour 15
FLF
FLASH FREQUENCY
0
1
approximately 1 Hz with a 50% active ratio
approximately 2 Hz with a 50% active ratio
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