3-wire serial LCD interface for the PICIf you are developing applications for the PIC, and miss the costly debugging tools, or can’t afford a parallel LCD interface in your design, this serial interface can help printing debug messages and/or reduce the pin count. This version uses a Hitachi HD44780 compatible LCD module in 4-bit mode. The interface is based on the idea of Myke Predko.

3-wire serial LCD interface for the PIC
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3-wire serial LCD interface for the PIC