This Application Note shows how the C505L can be used to control a Liquid CrystalDisplay. The example provided uses the C505L LCD controller and A/D Converter toimplement a simple voltmeter.1 Introduction..32 Theory of Liquid Crystal Displays32.1 Structure of Liquid Crystal Displays 32.2 Multiple Backplanes to Reduce the Pin Count..63 Control of LCDs .74 LCD Controller of the C505L..115 Connecting an LCD to the C505L.126 The Application146.1 Hardware and Connections ...146.2 Software Algorithms15Appendix 17A Main.c..17B LCD.c ..19C Putchar.c ..19D LCD.h..21E Reg505l.h .22