p87c770aar NXP Semiconductors, p87c770aar Datasheet - Page 50

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

Philips Semiconductors
18.7.1
The screen colour display area starts with a fixed offset of
8 s from the leading edge of the horizontal sync pulse in
the horizontal direction. A vertical offset is not necessary.
Table 68 Screen colour display area
18.7.2
Table 69 Text display area
The text area can be defined to start with an offset in both
the horizontal and vertical direction. The horizontal offset
is set in the Text Horizontal Position Register (see
Section 18.9.3). The offset is in full width characters
(1 to 64 characters) and quarter characters for fine setting
(0 to 3 quarters). The vertical offset is set in the Text
Vertical Position Register (see Section 18.9.2). The offset
is done in number of lines (0 to 63).
Table 70 Text area start offset
Note
1. The values ‘000000’ to ‘000011’ will result in a
1999 Jun 11
Horizontal
Vertical
Horizontal
Vertical
5
0
1
POSITION
POSITION
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
corrupted offset.
4
0
1
TAS<5-0>
3
0
1
S
T
EXT DISPLAY AREA
CREEN COLOUR DISPLAY AREA
2
0
1
(1)
Start at 8 s after leading edge of
HSYNC for 56 s.
Line 6, Field 1 (269, Field 2) to leading
edge of vertical sync.
Up to 48 full sized characters per row.
Start position setting from 3 to 64
characters from the leading edge of
HSYNC. Fine adjustment in quarter
characters.
208 lines (nominal 38 to 245). Start
position setting from leading edge of
vertical sync, legal values are 4 to 64
lines.
1
0
1
0
0
1
TEXT POSITION HORIZONTAL
DESCRIPTION
TEXT AREA START
525-LINE
63 characters
0 characters
50
Table 71 Text area fine offset
Table 72 Text vertical position
The width of the text area is defined by setting the end
character value (1 to 64 characters). This number
determines where the background colour will end if set to
extend to the end of the row. It will also terminate the
character fetch process thus eliminating the necessity of a
row end attribute. This entails however writing to all
positions.
The text area end is set by the TAE0 to TAE5 bits in the
Text Area End Register (see Section 18.9.5). The width is
the difference between the horizontal offset and the end
value and is always as a number of full width characters
(0 to 48 valid range). The quarter character offset in the
Text Horizontal Position Register is also valid for the end
position.
Table 73 Text area end
5
0
1
5
0
1
HOP1
0
0
1
1
4
0
1
4
0
1
VOL<5-0>
TAE<5-0>
3
0
1
3
0
1
2
0
1
2
0
1
HOP0
0
1
0
1
1
0
1
1
0
1
0
0
1
0
0
1
TEXT POSITION HORIZONTAL
TEXT AREA VERTICAL LINE
FULL CHARACTERS
TEXT AREA END
P8xCx70 family
FINE OFFSET
64 characters
1 character
0 quarters
2 quarters
3 quarters
1 quarter
OFFSET
63 lines
Product specification
0 lines