OM8373 datasheet(33/108 Pages) PHILIPS

33 / 108 page

2004 Jan 15

Philips Semiconductors

Tentative Device Speciﬁcation

TV signal processor-Closed Caption

decoder with embedded

µ-Controller

OM8373; OM8378

CURSOR

The cursor operates by reversing the background and

foreground colours in the character position pointed to by

the active cursor position. The cursor is enabled using

TXT7.CURSOR ON. When active, the row the cursor

appears on is defined by TXT9.R<4:0> and the column is

defined by TXT10.C<5:0>.

The valid range for row is 0 to 15. The valid range for

column is 0 to 47. The cursor remains rectangular at all

times, it’s shape is not affected by italic attribute, therefore

it is not advised to use the cursor with italic characters.

SPECIAL GRAPHICS CHARACTERS

Several special characters are provided for improved OSD

effects. These characters provide a choice of 4 colours

within a character cell. The total number of special

graphics characters is limited to 8. They are stored in the

character codes 8Xh of the character table (16 ROM

characters), or in the DRCs which overlay character codes

8Xh. Each special graphics character uses two

consecutive normal characters.

Fringing, underline and overline is not possible for special

graphics characters. Special graphics characters are

activated when TXT20.OSD_PLANE = 1.

The example in Fig.14 can be done with 8 special graphics

characters.

If the screen colour is transparent (implicit in mixed mode)

and inside the object the box attribute is set, then the

object is surrounded by video. If the box attribute is not set

the background colour inside the object will also be

displayed as transparent.

SMOOTHING

Smoothing is activated using MMR 87F0<3>. The clarity of

Double Height, Double Width and Double Size Characters

are all improved when smoothing is enabled.

Smoothing is automatically disable for the duration of any

special graphic characters.

A B C D E F

Fig.13 Cursor Display

VOLUME

Background Colour

Foreground Colour 7

Background Colour

Serial Attribute

“set at” (Mode 0)

Background Colour

“set after” (Mode 1)

Foreground Colour

Normal Character

Foreground Colour 6

Special Character

Fig.14 Special Character Example

Plane

Colour Allocation

0 0

Background Colour

0 1

Foreground Colour

1 0

CLUT entry 6

1 1

CLUT entry 7

Table 11 Special Character Colour allocation

OM8373 Datasheet(PDF) 33 Page - NXP Semiconductors

OM8373 Datasheet(HTML) 33 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL