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Using the DS89C450 as a static LCD display controller

Posted: 11 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:LCD display controller? LED display? microcontrollers?

LCD panels are used in a variety of modern electronic equipment like calculators, handheld blood glucose meters, gas station pumps, and television sets. Because of their lower power consumption and easy viewing in direct light, LCDs have replaced older LED displays in many applications. A range of microcontrollers (such as the MAXQ2000 and the MAXQ3120) integrate LCD controllers capable of driving LCD panels at up to a .25-muxed duty cycle. But in some instances, the ideal microcontroller for a particular application may not integrate an LCD controller. For these situations it is possible to implement a display controller in software by using the MCU's port pins to drive the display.

This application note describes how to implement a display controller for a simple, static LCD panel with 7-segment digits by using the DS89C450 ultra-high-speed flash MCU. Because no features specific to the DS89C450 are used, this example code can easily be ported to any 8051-compatible MCU, as long as that MCU has a sufficient number of port pins to drive the LCD panel used in the application.

Please view the PDF document for more information.




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