OM8373 datasheet(36/108 Pages) PHILIPS

36 / 108 page

2004 Jan 15

Philips Semiconductors

Tentative Device Speciﬁcation

TV signal processor-Closed Caption

decoder with embedded

µ-Controller

OM8373; OM8378

Screen and Global Controls

A number of attributes are available that affect the whole

display region, and cannot be applied selectively to

regions of the display.

TV SCAN LINES PER ROW

The number of TV scan lines per field used for each

display row can be defined, the value is independent of the

character size being used. The number of lines can be

either 10/13/16/18 per display row. The number of TV scan

lines per row is defined TXT21.DISP_LINES<1:0>.

A value of 9 lines per row can be achieved if the display is

forced into 525 line display mode by

TXT17.DISP_FORCE<1:0>, or if the device is in 10 line

mode and the automatic detection circuitry within display

finds 525 line display syncs.

CHARACTER MATRIX (HXV)

There are several different character matrices available,

these are 12x10, 12x13, 12x16, 12x18, 16x10, 16x13,

16x16 and 16x18. The selection is made using

TXT21.CHAR_SIZE<1:0> and TXT10.CHAR_16/12 and

is independent of the number of display lines selected per

row.

If the character matrix is less than the number of TV scan

lines per row then the matrix is padded with blank lines. If

the character matrix is greater than the number of TV scan

lines then the character is truncated.

CHARACTER SPACING

Characters may be spaced in both the horizontal and

vertical directions. Inter character spacing in the horizontal

direction can be defined using TXT37.CHAR SPACE<2:0>

(0-4 pixels) and the number of TV lines between character

rows can be defined using TXT37.TV LINE SPACE<2:0>

(0-7 TV lines). These spacing are applied outside the

selected character matrix and in addition to the number of

TV lines per row.

DISPLAY MODES

When attributes superimpose or when boxing (see Table

13, Serial Mode 0/1, bit 6) is set, the resulting display

depends on the setting of the following screen control

mode bits in REG0:Display Control.

SCREEN COLOUR

Screen colour is displayed from 10.5 ms to 62.5 ms after

the active edge of the HSync input and on TV lines 23 to

310 inclusive, for a 625 line display, and lines 17 to 260

inclusive for a 525 line display.

The screen colour is defined by REG0:Display Control and

points to a location in the CLUT table. The screen colour

covers the full video width. It is visible when the Full Text

or Mixed Screen Colour mode is set and no foreground or

background pixels are being displayed.

Text Display Controls

TEXT DISPLAY CONFIGURATION

Two types of area are possible. The one area is static and

the other is dynamic. The dynamic area allows scrolling of

a region to take place. The areas cannot cross each other.

Only one scroll region is possible.

Display Map

The display map allows a flexible allocation of data in the

memory to individual rows.

Sixteen words are provided in the display memory for this

purpose. The lower 10 bits address the first word in the

Display Mode

MOD

Description

Video

0 0

Video mode disables all display

activities and sets the RGB to true

black and VDS to video.

Full Text

0 1

Full Text mode displays screen

colour at all locations not covered by

character foreground or background

colour. The box attribute has no

effect.

Mixed Screen

Colour

1 0

Mixed Screen mode displays screen

colour at all locations not covered by

character foreground, within boxed

areas or, background colour.

Mixed Video

1 1

Mixed Video mode displays video at

all locations not covered by

character foreground, within boxed

areas or, background colour.

Table 14 Display Modes

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