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M37271MF-252SP Datasheet(PDF) 58 Page - Mitsubishi Electric Semiconductor |
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M37271MF-252SP Datasheet(HTML) 58 Page - Mitsubishi Electric Semiconductor |
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58 / 97 page  MITSUBISHI MICROCOMPUTERS M37271MF-XXXSP M37271EF-XXXSP, M37271EFSP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER 58 (6) Memory for OSD There are 2 types of memory for OSD : ROM for OSD (addresses 1080016 to 1567F16, 1800016 to 1E43F16) used to store character dot data (masked) and RAM for OSD (addresses 080016 to 0FFF16) used to specify the characters and colors to be displayed. The fol- lowing describes each type of memory. 1 1 1 1 1 ROM for OSD (addresses 1080016 to 1567F16, 1800016 to 1E43F16) The ROM for OSD contains dot pattern data for characters to be displayed. To actually display the character code and the extra code stored in this ROM, it is necessary to specify them by writing the character code inherent to each character (code determined based on the addresses in the ROM for OSD) into the RAM for OSD. The OSD ROM of the character font has a capacity of 12800 bytes. Since 40 bytes are required for 1 character data, the ROM can stores up to 320 kinds of characters. The OSD ROM of the extra font has a capacity of 1664 bytes. Since 52 bytes are required for 1 character data, the ROM can stores up to 32 kinds of characters. Data of the character font and extra font is specified shown in Figure 66. Fig. 66. OSD character data storing form OSD ROM address of character font data AD16 AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 Line number Character code Font bit “0216” to “1516” “0016” to “13F16” 0 : left font 1 : right font OSD ROM address bit Line number/character code/font bit 10 Line number Character code Font bit AD16 AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 11 00 00 0216 000016 7FF016 7FF816 601C16 600C16 600C16 600C16 600C16 0916 0316 0416 0516 0616 0716 0816 0A16 601C16 7FF816 7FF016 630016 638016 61C016 60E016 607016 1116 0B16 0C16 0D16 0E16 0F16 1016 603816 601C16 600C16 000016 1516 1216 1316 1416 b0 b7 b0 b7 0216 000316 000316 000316 000316 000316 000316 000316 000316 0916 0316 0416 0516 0616 0716 0816 0A16 000316 000316 000316 000316 000316 000316 000316 000316 1116 0B16 0C16 0D16 0016 0016 1016 000316 000316 000316 000316 1516 1216 1316 1416 b0 b7 b0 b7 FFFF16 FFFE16 000016 000016 1916 1616 1716 1816 0016 0116 FFFE16 FFFF16 Line number Line number Extra code Font bit “0016” to “1916” “0016” to “1F16” 0 : left font 1 : right font OSD ROM address bit Line number/extra code /font bit Extra code Line number Left font Right font Line number Data in OSD ROM Left font Right font Data in OSD ROM OSD ROM address of extra font data Character font Extra font Font bit = = = = = = |
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