AN202 LOW PIN-COUNT LCD INTERFACE
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.
Key Points:
● The software provided translates ASCII characters into 7-segment digits, compatible with the printf() standard library function.
● The LCD used in this example has 19 pins (4 Common and 15 Segment). Seven pins are used on the microcontroller: four for the Common pins and three that serve as a serial interface to a pair of 74HC595 8-bit, latched shift registers which are the segment drivers.
● The refresh rate of the LCD is chosen to minimize power consumption as well as minimize flickering.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2017/07/27 |
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Rev. 0.2 |
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AN202 |
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2.1 MB |
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