ST92195D datasheet(121/249 Pages) STMICROELECTRONICS

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ST92195C/D - ON SCREEN DISPLAY (OSD)

ON SCREEN DISPLAY (Cont’d)

7.4.7 Font Mapping

The font consists of two character sets of 512

characters each. Only one set can be accessed at

the same time. The FRSW bit of the NCSR regis-

ter allows to switch from one set to the other.

G0 is the basic character font.

G1 is the mosaic font. It is not stored in ROM but is

implemented in hardware. In serial mode it is ad-

dressed by a serial attribute (See Table 20. on

page 104). In parallel mode it is accessed by bit 0

(CSS) of the parallel shape attribute and bit 1 (US)

for separated mosaic (See Table 21. on page

108).

G2 is a font of X/26 based + Menu shared charac-

ters.

An Extended Menu character font available in par-

allel mode. It is accessed via bit 0 (CSS) in the par-

allel shape attribute (Character Set Selection).

The Extended Menu font is not accessible in serial

mode.

7.4.8 Font Mapping Modes

There are two font mapping modes selected by the

NCM bit in the NCSR register R245 (F5h) Page

32:

Single G0 mode

A set combining 83 characters from

the G0 basic set plus 13 characters

selected from 15 National character

subsets. The National character sub-

sets are selected by four bits (NC3:0)

in the NCSR register R245 (F5h)

Page 32.

Triple G0 mode

Three 96-character character sets

(G0-0, G0-1 and G0-2) for multi al-

phabet applications. Character set

selection is done by four bits (NC1:0

or NC3:2) in the NCSR register R245

(F5h) Page 32.

– In Serial Mode (Level 1), only 256 Character

Codes are available using an 8-bit code. The

character codes plus some serial attributes and

some additional programmable options address

566 chars: 256 + 182 NS chars + 128 mosaics in

single G0 mode.

– In Parallel Mode (Enhanced Level 1), 512 Char-

acter Codes are available using a 9-bit code. The

character codes plus some serial and parallel at-

tributes, and some additional programmable op-

tions address 662 chars: 256 + 182 NS chars +

128 mosaic + 96 extended chars. in single G0

mode.

Display ROM Font Entry:

The user must define his own fonts for each set of

characters:

– 278 characters: - 15 x 13 G0 National Character

subsets + 83 G0 Character set

– 288 characters: 3 x 96-character character sets

– 128 G2 based X/26 and Menu characters

– 96 Extended Menu characters

Table 24. Triple G0 Mode - Font Mapping

ROM

Address

Character

Code

CSS

Font Usage

000h to 01Fh 0E0h to 0FFh

Extended menu

020h to 07Fh 020h to 07Fh

(or serial

mode)

G0 set 0

080h to 0FFh 080h to 0FFh

G2 + Menu

100h to 15Fh 020h to 07Fh

G0 set 1

160h to 1BFh 020h to 07Fh

G0 set 2

1C0h to 1FFh 0A0h to 0DFh

Extended menu

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