PCA84C846 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

PCA84C846

Microcontrollers for TV tuning control and OSD applications

Philips Electronics 

Philips Semiconductors

Microcontrollers for TV tuning

control and OSD applications

Preliminary specification

PCA84C646; PCA84C846

Table 12 Format of Carriage Return Code

9

8

7

6

5

4

3

2

1

0

C5

C4

C3

C2

C1

C0

T3

T2

T1

T0

Carriage Return Code (3EH)

Character size

Line Spacing

Table 13 Description of Carriage Return Code bits; format is shown in Table 12

SYMBOL

DESCRIPTION

C5 to C0 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.

T3 to T2 Bits <3-2> select the size of the of the character to be displayed on the next line; see Table 14.

T1 to T0

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.

Table 14 Selection of character size

T3

T2

CHARACTER DOT SIZE(1)

0

0

0

1

1

0

1

1

1H/1V

2H/2V

3H/3V

4H/4V

Note

1. H is the OSD clock period; V is the number of

horizontal scan lines per dot.

Table 15 Selection of line spacing

T1

T0

0

0

0

1

1

0

1

1

LINE SPACING

0H line

4H line

8H line

12H line

Table 16 Format of Space Code

9

8

7

6

5

4

3

2

1

0

C5

C4

C3

C2

C1

C0

T3

T2

T1

T0

Space Code (3FH)

Background colour

End

Table 17 Description of Space Code bits; format is shown in Table 16

SYMBOL

DESCRIPTION

C5 to C0 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.

T3 to T1

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.

T0

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 64th RAM location or a Space

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.

1995 Jun 15

20

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