p87c770aar NXP Semiconductors, p87c770aar Datasheet - Page 46

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

Philips Semiconductors
18.5.1.3
The top display row of the scroll area is set using the
SSP0 to SSP3 bits in the Soft Scroll Area Control Register
(see Section 18.9.6).
Table 63 Soft scroll area position value
18.5.1.4
The visible scroll area height is set using the
SSH0 to SSH3 bits in the Soft Scroll Area Control Register
(see Section 18.9.6).
Table 64 Soft scroll area height value
1999 Jun 11
handbook, full pagewidth
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
3
0
1
3
0
1
SSH<3-0>
SSP<3-0>
2
0
1
2
0
1
Top display row select
Visible scroll area height selection
1
0
1
1
0
1
0
0
1
0
0
1
(SSH3 to SSH0 e.g. 4)
(SSP3 to SSP0 e.g. 6)
scroll area position
visible area height
DISPLAY AREA POSITION
DISPLAY AREA HEIGHT
pointer
16 Rows
Row 15
Row 0
1 Row
ROW
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Fig.17 Soft scroll area.
46
18.5.1.5
The scroll rows range is set in the Scroll Rows Range
Register (see Section 18.9.7). Setting this register
initialises the scroll row counter so that the first (top) row is
the Start Scroll Row Number. By redefining the contents of
this register a hard scrolling can also be achieved. If a new
start scroll row number is loaded during a soft scroll action,
then this value will be taken as the new start value after the
scrolling action has been completed.
Table 65 Start scroll row number
Table 66 Stop scroll row number
3
0
1
3
0
1
usable for OSD display
should not be used for
OSD display
soft scrolling area
start row (STR3 to STR0 e.g. 3)
stop row (SPR3 to SPR0 e.g. 11)
should not be used for
OSD display
usable for OSD display
STS<3-0>
SPS<3-0>
2
0
1
2
0
1
Scroll rows range selection
1
0
1
1
0
1
0
0
1
0
0
1
MGL148
START SCROLL ROW
STOP SCROLL ROW
P8xCx70 family
Product specification
NUMBER
NUMBER
Row 15
Row 15
Row 0
Row 0