More and more applications are requiring liquid crystal displays (LCD) to
communicate effectively to the outside world. This application note
describes the hardware and software interface needed to display
information from the MC68HC912B32 (B32).
Some LCD suppliers provide only the LCD glass so that the waveforms
needed to directly drive the LCD segments have to be generated by the
microcontroller (MCU) or microprocessor (MPU). Other LCD suppliers
provide an LCD module, which has all LCD glass and segment drivers
provided in one small packaged circuit board.
This application note uses an LCD module from Optrex Corporation, part
number DMC16207 (207). It utilizes a Hitachi LCD driver, HD44780, to
provide the LCD segment waveforms and a simple parallel port interface
that easily interfaces to an MCU or MPU bus.