OM8373 datasheet(32/108 Pages) PHILIPS

32 / 108 page

2004 Jan 15

Philips Semiconductors

Tentative Device Speciﬁcation

TV signal processor-Closed Caption

decoder with embedded

µ-Controller

OM8373; OM8378

Foreground Colour

The foreground colour can be chosen from 8 colours on a

character by character basis. Two sets of 8 colours are

provided. A serial attribute switches between the banks

(see Table 13 Serial Mode 1, bit 7). The colours are the

CLUT entries 0 to 7 or 8 to 15.

Background Colour

This attribute is valid from the time set until end of row or

otherwise modified if set with Serial Mode 0. If set with

Serial Mode 1, then the colour is set from the next

character onwards.

The background colour can be chosen from all 16 CLUT

entries.

BACKGROUND DURATION

The attribute when set takes effect from the current

position until to the end of the text display defined in

REG4:Text Area End. The background duration attribute

(see Table 13, Serial Mode 1, bit 8) in combination with the

End Of Row attribute (see Table 13, Serial Mode 1, bit 9)

forces the background colour to be display on the row until

the end of the text area is reached.

UNDERLINE

The underline attribute causes the characters to have the

bottom scan line of the character cell forced to foreground

colour, including spaces. If background duration is set,

then underline is set until the end of the text area. The

underline attribute (see Table 13, Serial Mode 0/1, bit 4) is

valid from the time set until end of row or otherwise

modified.

OVERLINE

The overline attribute causes the characters to have the

top scan line of the character cell forced to foreground

colour, including spaces. If background duration is set,

then overline is set until the end of the text area.

The overline attribute (see Table 13, Serial Mode 0/1, bit

5) is valid from the time set until end of row or otherwise

modified. Overlining of Italic characters is not possible

END OF ROW

The number of characters in a row is flexible and can

determined by the end of row attribute (see Table 13,

Serial Mode 1, bit 9). However the maximum number of

character positions displayed is determined by the setting

of the REG2:Text Position Horizontal and REG4:Text Area

End.

NOTE: When using the end of row attribute the next

character location after the attribute should always be

occupied by a ’space’.

FRINGING

A fringe (shadow) can be defined around characters. The

fringe direction is individually selectable in any of the

North, South, East and West direction using

REG3:Fringing Control. The colour of the fringe can also

be defined as one of the entries in the CLUT, again using

REG3:Fringing Control.

The fringe attribute (see Table 13, Serial Mode 0, bit 9) is

valid from the time set until the end of the row or otherwise

modified.

Fig.12 South and Southwest Fringing

RED1-0

b5 . b4

GRN1-0

b3 . b2

BLU1-0

b1 . b0

Colour

entry

...

Table 10 CLUT Colour values

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