OM8373 datasheet(39/108 Pages) PHILIPS

39 / 108 page

2004 Jan 15

Philips Semiconductors

Tentative Device Speciﬁcation

TV signal processor-Closed Caption

decoder with embedded

µ-Controller

OM8373; OM8378

Re-deﬁnable Characters

A number of Dynamically Re-definable Characters (DRC)

are available. These are mapped onto the normal

character codes, and replace the pre-defined OTP

character Rom value.

There are 16 DRCs which occupy character codes 80H to

8FH. Alternatively, These locations can be utilized as 8

special graphics characters. The remapping of the

standard OSD to the DRCs is activated when the

TXT20.DRCS ENABLE bit is set. The selection of Normal

or Special OSD symbols is defined by the TXT20.OSD

PLANES.

Each character is stored in a matrix of 16x18x1 (V x H x

planes), this allows for all possible character matrices to be

defined within a single location.

Character code columns (Bits 4-7)

0123456789

1˚

1/2

¿#3

4™

¢%5

6£

7´

8à

(

)

Aè

Bâ

;

[

Cê

Dî

]

Eô

?Oó

Table 18 Closed Caption Character Table

Special Characters are in column 8.

Additional table locations for normal characters

Table locations for normal characters

CHAR 1

CHAR 2

CHAR 14

CHAR 15

CHAR 0

Address

16 bits

Micro Address

8800

8823

8824

8847

8848

886B

8A3F

8A1C

8A1B

89F8

Char Code

80h

81h

82h

8Eh

8Fh

Fig.19 Organisation of DRC RAM

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