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FT801 Datasheet(PDF) 21 Page - Future Technology Devices International Ltd. |
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FT801 Datasheet(HTML) 21 Page - Future Technology Devices International Ltd. |
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21 / 57 page  Copyright © 2014 Future Technology Devices International Limited 21 Document No.: FT_000986 FT801 Embedded Video Engine Datasheet Version 1.0 Clearance No.: FTDI#376 4.3.2 ROM and RAM Fonts The FT801 has built in ROM character bitmaps as font metrics. The graphics engine can use these metrics when drawing text fonts. There are total 16 ROM fonts, numbered with font handle 16-31. The user can define and load customized font metrics into RAM_G, which can be used by display command with handle 0-15. Each font metric block has a 148 byte font table which defines the parameters of the font and the pointer of font image. The font table format is shown in Table 4-6. Table 4-6 Font table format Address Offset Size(byte) Parameter Description 0 128 width of each font character, in pixels 128 4 font bitmap format, for example L1, L4 or L8 132 4 font line stride, in bytes 136 4 font width, in pixels 140 4 font height, in pixels 144 4 pointer to font image data in memory The ROM fonts are stored in the memory space ROM_FONT. The ROM font table is also stored in the ROM. The starting address of ROM font table for font index 16 is stored at ROM_FONT_ADDR, with other font tables follow. The ROM font table and individual character width (in pixel) are listed in Table 4-7 through Table 4-9. Font index 16, 18 and 20-31 are for basic ASCII characters (code 0-127), while font index 17 and 19 are for Extended ASCII characters (code 128- 255). The character width for font index 17 or 19 is fixed at 8 pixels for any of the Extended ASCII characters. Table 4-7 ROM font table Font Index 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Font format L1 L1 L1 L1 L1 L1 L1 L1 L1 L1 L4 L4 L4 L4 L4 L4 Line stride 1 1 1 1 2 2 2 3 3 4 6 8 9 11 14 18 Font width 8 8 8 8 10 13 14 17 24 30 12 16 18 22 28 36 Font height 8 8 16 16 13 17 20 22 29 38 16 20 25 28 36 49 Image pointer start address (hex) Table 4-8 ROM font ASCII character width in pixels Font Index => 16 18 20 21 22 23 24 25 26 27 28 29 30 31 0 NULL - - - - - - - - - - - - - - 1 SOH - - - - - - - - - - - - - - 2 STX - - - - - - - - - - - - - - 3 ETX - - - - - - - - - - - - - - 4 EOT - - - - - - - - - - - - - - 5 ENQ - - - - - - - - - - - - - - 6 ACK - - - - - - - - - - - - - - 7 BEL - - - - - - - - - - - - - - 8 BS - - - - - - - - - - - - - - 9 HT - - - - - - - - - - - - - - 10 LF - - - - - - - - - - - - - - 11 VT - - - - - - - - - - - - - - 12 FF - - - - - - - - - - - - - - 13 CR - - - - - - - - - - - - - - 14 SO - - - - - - - - - - - - - - 15 SI - - - - - - - - - - - - - - |
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