PCA8516P datasheet(9/64 Pages) PHILIPS

9 / 64 page

1995 Mar 30

Philips Semiconductors

Preliminary speciﬁcation

Stand-alone OSD

PCA8516

CHARACTER FONTS

256 character fonts may be held in ROM; 253 customer

selected fonts and three reserved character font codes.

Customer selected fonts are mask programmable. Each

character font is stored in a 12

× 19 dot matrix, as shown

in Fig.5. Elements in Rows 1 to 18 can be selected as

visible dots on the screen; Row 0 is used only for the

combination of two characters in a vertical direction, when

the North-West shadowing mode is selected (see

Sections 9.9 and 10.2). Extremely high resolution can be

achieved by having no spacing between characters on the

same line and by programming the inter-line spacing to

zero. The 12

× 18 dot matrix is suitable for the display of

semigraphic patterns, Kanji, Hiragana, Katagana or even

Chinese characters.

7.1

Character font address map

Figure 6 shows the character font address map in ROM

and RAM. Addresses FFH and FEH hold the reserved

codes for space and carriage return functions respectively;

address FDH is reserved for testing purposes and

addresses (00H to FCH) contain the character font codes.

7.2

Character font ROM

ROM is divided into two parts: ROM1 and ROM2. The

organization of the bit patterns stored in ROM1 and ROM2

is shown in Fig.7.

The file format to submit to Philips for customized

character sets is also shown in Fig.7. The following points

should be noted:

1. Row 0 of each font is reserved for vertical combination

of two fonts.

2. When two font cells are combined in a vertical

direction Row 0 of the lower font must contain the

same bit pattern as held in Row 18 of the character

above it.

3. Binary 1 denotes visual dots; binary 0 denotes a blank

space.

4. ROM1 and ROM2 data files are in INTEL hex format

on a byte basis. Each byte is structured High nibble

followed by Low nibble.

5. The remaining unused 16 bytes (one character font) in

ROM1/ROM2 must be filled with FFH.

6. CS denotes Checksum.

A software package (OSDGEM) that assists in the design

of character fonts on-screen and that also automatically

generates the bit pattern HEX files, is available on request.

The package is run under the MS-DOS environment for

IBM compatible PCs.

Fig.5 Character dot matrix organization.

MLC350

Fig.6 ROM address map.

253 (FDH)

254 (FEH)

255 (FFH)

Mask Programmable Font

Carriage return code

Space code

reserved code

MLB344

Test code

252 (FCH)

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