參數資料
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： 43/80頁
文件大?。?/td> 266K
代理商： P83C270AAR
1999 Jun 11
43
Philips Semiconductors
Product specification
Microcontrollers for NTSC TVs with On-Screen
Display (OSD) and Closed Caption (CC)
P8xCx70 family
18.3
Character and attribute coding
Character coding is split into character oriented attributes
(parallel) and character group coding (serial). The serial
attributes take effect at the set position and remain
effective until either modified by new serial attributes or
until the end of the row. A serial attribute is represented as
a space (the space character itself however is not used for
this purpose). The attributes are still active, e.g. overline
and underline will be visible.
The default settings at the start of a row are:
Foreground colour = 0, foreground colour switch = 0
(bank 0)
Background colour = 8
1x size
Flash off
Overline off
Underline off
Italics off
Display mode = superimpose
Fringing off
Background colour duration = 0
End of Row = 0.
The coding is done in 12-bit words. The codes are stored
sequentially in the display memory.
18.3.1
P
ARALLEL CHARACTER CODING
Table 54
Parallel character coding
18.3.2
S
ERIAL CHARACTER CODING
Table 55
Serial character coding
BITS
DESCRIPTION
0 to 7
8 to 10
11
8-bit character code
3 bits for 8 foreground colours
Mode bit: a logic 0 = parallel code
BITS
SERIAL MODE 0 (‘SET AT’)
SERIAL MODE 1
CHAR. POSITION = 1 (‘SET AT’) CHAR. POSITION >1 (‘SET AFTER’)
0 to 3
4
4 bits for 16 background colours 4 bits for 16 background colours
0 = Underline off
1 = Underline on
0 = Overline off
1 = Overline on
Display mode:
0 = Superimpose; 1 = Boxing
0 = Flash off
1 = Flash on
4 bits for 16 background colours
0 = Underline off
1 = Underline on
0 = Overline off
1 = Overline on
Display mode:
0 = Superimpose; 1 = Boxing
Foreground colour switch
0 = Bank 0 (colours 0 to 7)
1 = Bank 1 (colours 8 to 15)
Background colour duration (set at):
0 = stop BGC
1 = set BGC to end of row
End of Row (set at):
0 = Continue Row; 1 = End Row
Switch for Serial coding
Mode 0 and 1: 1 = Mode 1
Mode bit: 1 = Serial code
Horizontal Size:
0 = normal; 1 = x2
Vertical Size:
0 = normal; 1 = x2
Display mode:
0 = Superimpose; 1 = Boxing
Foreground colour switch
0 = Bank 0 (colours 0 to 7)
1 = Bank 1 (colours 8 to 15)
Background colour duration:
0 = stop BGC
1 = set BGC to end of row
End of Row
0 = Continue Row; 1 = End Row
Switch for Serial coding
Mode 0 and 1: 1 = Mode 1
Mode bit: 1 = Serial code
5
6
7
8
0 = Italics off
1 = Italics on
9
0 = Fringing off
1 = Fringing on
Switch for Serial coding
Mode 0 and 1: 0 = Mode 0
Mode bit: 1 = Serial code
10
11
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