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PCA8516T Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCA8516T Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 64 page  1995 Mar 30 9 Philips Semiconductors Preliminary specification Stand-alone OSD PCA8516 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 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. 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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