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TMP88CS38 Datasheet(PDF) 146 Page - Toshiba Semiconductor |
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TMP88CS38 Datasheet(HTML) 146 Page - Toshiba Semiconductor |
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146 / 226 page  TMP88CS38/CM38A/CP38A 2007-09-12 88CS38-146 2.15.2 Character ROM and Display Memory (1) Character ROM The character ROM contains 384 character fonts. The user can set fonts as desired. The character ROM consists of 384 characters in 16 × 18 dots (Character codes 000H to 17FH). Each dot corresponds to one bit in the character ROM. When a bit in the character ROM is set to “1”, the corresponding dot is displayed; if set to “0”, the dot is not displayed. The start address in the character ROM corresponding to a character code is determined by the following expression: Start address in character ROM = CRA × 40H + 20000H Since character code 000H is used as blank character, the character font for this character code cannot be changed. Write “0” in the data of character code 000H. Write the data “FFH” to all unused address (5th bit of an address is “1” and also the lower 4 bits of an address are 2H to FH) in character ROM. Figure 2.15-2 (a) shows an example of the character font configuration for the character code 000H and 001H, together with the ROM addresses and data. Figure 2.15.2 (b) shows the character ROM dump list for these 2 character fonts. Note 1: CRA: Character code (000H to 17FH). Note 2: A data can not be read from character ROM by software. Note 3: When ordering a mask, load the data to character ROM at addresses 20000H to 25FFFH. And the data in unused are of character ROM are must be specified to FFH. 20000/ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20010/ 00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF 20020/ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20030/ 00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF 20040/ 3F 7F E0 C0 00 00 00 01 03 07 0E 1C 38 70 FF FF 20050/ 00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF 20060/ C0 E0 70 30 30 70 E0 C0 80 00 00 00 00 00 F0 F0 20070/ 00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF Note: Shared portions indicate unused data. Figure 2.15-2 Character Font Configuration and ROM Dump List 20000 20001 20002 20003 20004 20005 20006 20007 20008 20009 2000A 2000B 2000C 2000D 2000E 2000F 20010 20011 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Address (Hex) Data (Hex) 20020 20021 20022 20023 20024 20025 20026 20027 20028 20029 2002A 2002B 2002C 2002D 2002E 2002F 20030 20031 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Address (Hex) Data (Hex) (Character code 000H) 7 6 5 4 3 2 1 0 Bit 7 6 5 4 3 2 1 0 Bit (a) Character font configuration 20040 20041 20042 20043 20044 20045 20046 20047 20048 20049 2004A 2004B 2004C 2004D 2004E 2004F 20050 20051 3F 7F E0 C0 00 00 00 01 03 07 0E 1C 38 70 FF FF 00 00 Address (Hex) Data (Hex) 20060 20061 20062 20063 20064 20065 20066 20067 20068 20069 2006A 2006B 2006C 2006D 2006E 2006F 20070 20071 C0 E0 70 30 30 70 E0 C0 80 00 00 00 00 00 F0 F0 00 00 Address (Hex) Data (Hex) (Character code 001H) 7 6 5 4 3 2 1 0 Bit 7 6 5 4 3 2 1 0 Bit (b) ROM dump list |
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