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參數資料
| 型號： | 935176920112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 畫面疊加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDSO24 |
| 封裝： | PLASTIC, SOT-137-1, SO-24 |
| 文件頁數： | 66/66頁 |
| 文件大小： | 445K |
| 代理商： | 935176920112 |
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1995 Jan 19
9
Philips Semiconductors
Preliminary specication
Stand-alone OSD
PCA8515
7
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
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.
0
1
2
3
4
5
6
7
8
9
10
11
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
MLC350
Fig.6 ROM address map.
0
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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