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6

Most HD44780 based and similar LCDs have two areas for the fonts, the GCROM and the GCRAM. the GCROM is not editable as this is written by manufacturer, while the GCRAM allows for user defined characters. This area allows the user to define 8 characters, and are usually used for custom symbols. There are several tutorials online, just search for "HD44780 ...


2

Character generator ROM is mask programmed, so the font ROM is not written, the ROM content is just set during chip manufacturing process. They cannot be reprogrammed by user. You can order e.g. HD44780 and other controller chips with custom characters from chip manufacturer.


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