Back to basic LCD interfacing app note(PDF!) from Silicon Labs.
This application note provides an example interface for a C8051F330 device with an example LCD. First, this application note describes how an LCD works and then describes the two types of LCDs: direct drive and multiplexed drive. Next, the software interface and structure are explained. Finally, this note describes how to modify the software example to work with other LCDs.
The code accompanying this application note was originally written for C8051F33x devices. The code can also be ported to other devices in the Silicon Labs microcontroller range.