Peter's electronic projects

3-wire serial LCD interface for the PIC

version 2
based on the idea of Myke Predko

description

If you are developing applications for the PIC mcu, and miss debugging tools, or don't have enough I/O pins for 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. See this link for more details.

software

My default PIC pins for the interface connection are RB4 (EN), RB5 (CK), RB6 (DA). I choose these pins due to PCB layout simplicity on the 18 pin devices. It is the task of your application to correctly initialize the TRIS bits of the used port pins!

schematic diagram