83C055 Philips Semiconductors, 83C055 Datasheet - Page 20

• Manufacturer Part Number: 83C055
• Description: Microcontrollers for TV and video MTV
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Table 19 Special characters related to OSDT register
13.6.3
Table 20 Special Function Register OSAT ( On Screen ATtributes; address 98H)
Table 21 Description of OSAT bits
1996 Mar 22
SPECIAL CHARACTER
New Line
Space (normal)
BSpace
SplitBspace
New Line
BSpace
SplitBSpace
Any other character
7 to 5, 3
With OSDT = New Line; note 1
With OSDT = BSpace or SplitBspace; note 2
With OSDT = Any other character
2 to 0
2 to 0
Microcontrollers for TV and video (MTV)
BIT
4
2
1
0
4
4
WITH OSDT =
S
PECIAL FUNCTION REGISTER
BC2 to BC0 Bcolor: Background colour (notes 3 and 4; see Table 22).
FC2 to FC0 Fcolor: Foreground colour. Fcolor indicates the colour of ‘foreground pixels’ in the ROM bit
SYMBOL
SR
Sh
E
D
B
B
Reserved.
End; If the E bit is 1, no further rows are displayed on the screen.
Short row; If E = 0 and SR = 1, the next row is a ‘short row’, i.e. it is only 4 or 8 scan lines high
rather than 18 or 36. Short rows can be used for underlined text.
Double height; If E = 0 and D = 1, all of the characters in the following row are displayed with
‘double height and width’.
Shadowing; If E = 0 and Sh = 1, all of the characters in the following row are displayed with
‘shadowing’; see Section 13.8.
Background; B indicates whether ‘background pixels’ should show the current background
colour (B = 1), or television video (B = 0).
Background; B indicates whether ‘background pixels’ should show the current background
colour (B = 1), or television video (B = 0).
map for this character (see Table 22).
OSDT5
7
1
1
1
1
OSAT
6
OSDT4
1
1
1
1
5
20
OSDT3
DESCRIPTION
1
1
1
1
E
B
B
B
4
OSDT2
3
1
1
1
1
BC2
BC2
FC2
SR
2
83C145; 83C845
83C055; 87C055
OSDT1
0
0
1
1
Product specification
BC1
BC1
FC1
D
1
OSDT0
1
0
0
1
BC0
BC0
FC0
Sh
0