參數(shù)資料
型號(hào)： P87C770AAR
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, OTPROM, 12 MHz, MICROCONTROLLER, PDIP52
文件頁(yè)數(shù)： 47/80頁(yè)
文件大?。?/td> 266K
代理商： P87C770AAR
1999 Jun 11
47
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
18.5.2
S
CROLL MAP
The scroll map allows a flexible allocation of data in the memory, to individual rows. Sixteen 12-bit words are provided in
the display memory for this purpose. The bit allocation is shown in Table 67. The scroll map memory is located in the
first 16 words in the display memory (data byte addresses 8000H to 801FH) as shown in Fig.18.
Table 67
Scroll map word format
BIT
DESCRIPTION
11
10
9 to 0
Text display enable, valid outside soft scroll area. A logic 0 = disable; a logic 1 = enable.
Reserved, should be set to a logic 0.
Pointer to row data.
Fig.18 Scroll map and data pointers.
handbook, full pagewidth
MGK549
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
Row counter
0 to 15 valid
10
11
Scroll counter
3 to 11 valid
3
4
9
10
11
12
13
14
15
Row counter
0 to 15 valid
display
possible
un-usable for
OSD display
soft Scrolling
display possible
un-usable for
OSD display
display
possible
available
rows for
scrolling
Scroll
Map
entries
display
data
Display memory
Text area
ROW
Enable
bit = 0
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