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| 型号： | P83C770AAR |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | Microcontrollers for PAL/SECAM TV with OSD and VST(带 OSD和 VST的在PAL/SECAM TV中应用的微控制器) |
| 中文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PDIP52 |
| 文件页数： | 41/80页 |
| 文件大小： | 266K |
| 代理商： | P83C770AAR |
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1999 Jun 11
41
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
18.2.9
F
OREGROUND COLOUR
The foreground colour can be chosen from 8 colours on a
character-by-character basis. Two sets of 8 colours are
provided. A serial attribute switches between the banks
(see Serial Mode 1, bit 7). The colours are the CLUT
entries 0 to 7 or 8 to 15.
18.2.10 B
ACKGROUND COLOUR
This attribute is valid from the time set until end of row or
otherwise modified if set with Serial Mode 0. If set with
Serial Mode 1, then the colour is set from the next
character onwards (see Section 18.3.2).
The background colour can be chosen from all 16 CLUT
entries.
18.2.11 B
OXES
This attribute is valid from the time set until end of row or
otherwise modified if set with Serial Mode 0. If set with
Serial Mode 1, then it is set from the next character
onwards (see Section 18.3.2).
In text mode the background colour is displayed
regardless of the setting of the box attribute bit. Boxes take
affect 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 Display Control
Register) instead of the background colour.
18.2.12 M
ESHING
Meshing effects the background colour:
In text mode all background colour will be meshed
During mixed modes the background colour will only be
displayed where boxes are active, therefore meshing
will only be displayed inside these areas.
The appearance of the background colour is modified by
the meshing control bit (MSH). If meshing is set then the
background pixels, where displayed, are alternately
displayed at pixel rate in the background colour and as
video/screen colour, depending on which of the mixed
modes is set. The structure is offset by 1 pixel from
scan-line to scan-line, thus achieving a checker board
display of the background colour.
Meshing is set in the Display Control Register, see
Section 18.9.1.
18.2.13 B
ACKGROUND DURATION
The background duration attribute can be set with the
Serial Mode 1 attribute, see Section 18.3.2.
In combination with the End Of Row attribute (see
Section 18.2.17), it forces the background colour to be
displayed on the row until the end of the text area is
reached.
When set, this attribute takes effect from the current
position until the end of the text display as defined in the
Text Area End Register (see Section 18.9.5).
18.2.14 U
NDERLINE
This attribute is valid from the time set until end of row or
otherwise modified if set with Serial Mode 0. If set with
Serial Mode 1, then it is set from the next character
onwards (see Section 18.3.2).
The underline attribute causes the characters to have the
bottom scan-line of the character cell forced to foreground
colour, including spaces. If background duration is set,
then underline is set until the end of the text area.
18.2.15 O
VERLINE
This attribute is valid from the time set until end of row or
otherwise modified if set with Serial Mode 0. If set with
Serial Mode 1, then it is set from the next character
onwards (see Section 18.3.2).
The overline attribute causes the characters to have the
top scan-line of the character cell forced to foreground
colour, including spaces. If background duration is set,
then overline is set until the end of the text area.
18.2.16 S
PECIAL GRAPHIC CHARACTERS
Several special characters are provided for special effects.
These characters provide a choice of 4 colours within a
character cell. The number of characters is limited to 16.
Characters are stored in columns 8 and 9 of the ROM
table (32 ROM characters). Each character uses the ROM
contents of 2 normal characters. Addressing is therefore
done using only the even character addresses. The pixel
planes are stored in adjacent character locations, always
starting with an even character. The pixel plane 0 is stored
in the even character and pixel plane 1 is stored in the odd
character ROM position
There is no fringing possible for these characters.
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