PCA84C646P PHILIPS [NXP Semiconductors], PCA84C646P Datasheet - Page 20

• Manufacturer Part Number: PCA84C646P
• Description: Microcontrollers for TV tuning control and OSD applications
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Table 12 Format of Carriage Return Code
Table 13 Description of Carriage Return Code bits; format is shown in Table 12
Table 14 Selection of character size
Note
1. H is the OSD clock period; V is the number of
Table 16 Format of Space Code
Table 17 Description of Space Code bits; format is shown in Table 16
1995 Jun 15
C5 to C0
T3 to T2
T1 to T0
C5 to C0
T3 to T1
T0
SYMBOL
SYMBOL
Microcontrollers for TV tuning
control and OSD applications
horizontal scan lines per dot.
C5
C5
T3
9
0
0
1
1
9
If bits <9-4> hold 3EH, then this is the Carriage Return Code. The current display line is terminated
(a transparent pattern appears on the screen) and the next character will be displayed at the beginning of
the next line.
Bits <3-2> select the size of the of the character to be displayed on the next line; see Table 14.
Bits <1-0> determine the spacing between lines of displayed characters. Spacing is a multiple of the
number of horizontal scan lines. In order to prevent vertical jumping of the display, the first line should be
a non-displayed line i.e. the Carriage Return Code.
The line spacing for this code must not be zero; see Table 15.
If bits <9-4> hold 3FH, then this is the Space Code. A transparent pattern, equal to one character width,
will be displayed on the screen.
Bits <3-1> determine the background colour of the characters including the Space Code in Box
shadowing mode but following the Space Code in North-west shadowing mode. See Section 12.4 for
more details. Background colour selection is the same as Foreground colour selection; see Table 11.
Bit <0> is the End-of-Display bit and indicates the end of display of the current screen before exhaustion
of display RAM. The last character displayed on the TV screen is either the 64
Code with the End-of-display attribute set to logic 1.
When T0 = 0; continue display of next character.
When T0 = 1; end of display.
T2
C4
C4
0
1
0
1
8
8
Carriage Return Code (3EH)
Space Code (3FH)
CHARACTER DOT SIZE
C3
C3
7
7
1H/1V
2H/2V
3H/3V
4H/4V
C2
C2
6
6
C1
C1
(1)
5
5
DESCRIPTION
DESCRIPTION
20
Table 15 Selection of line spacing
C0
C0
4
4
T1
0
0
1
1
T3
3
T3
Character size
3
PCA84C646; PCA84C846
T0
0
1
0
1
Background colour
T2
2
T2
2
th
RAM location or a Space
LINE SPACING
Preliminary specification
12H line
0H line
4H line
8H line
T1
1
T1
1
Line Spacing
End
T0
T0
0
0