PDF datasheet for the SED1278, 165 KB. The SED1278 is an Epson dot-matrix character LCD controller, broadly compatible with the HD44780 used in common alphanumeric text modules. The document normally covers the instruction set, character generator memory, pin functions, bus timing and supply requirements. It is handy when troubleshooting a text display that shows black boxes or nothing at all, by checking contrast voltage, enable and data lines. Confirm the controller marking on the module before relying on timing values.
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