Key facts
- Brand
- STMicroelectronics
- Model
- ST6-REALIZER
- Category
- Other Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2012-08-07
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STMicroelectronics AN842 7-Segment Display Drive Application Note
This document explains the principles of operating 7-segment displays, including the structure of the display and the required segment patterns for numeric representation. It details the hardware considerations for biasing the display using I/O lines on the ST62 MCU.
The text focuses on generating control software using the ST6-REALIZER tool. It compares two software implementation approaches: using multiple bitwise lookup tables versus a single bytewise lookup table, quantifying the reduction in execution time. It also covers extending these concepts to multiple-digit display systems using multiplexing techniques.
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How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the minimum refresh frequency required to avoid flicker?
The refresh frequency must be at least 20 cycles per second to ensure image persistence and avoid flicker.
From: STMicroelectronics AN842 7-Segment Display Drive Application Note
What is the recommended switching period for multiplexing multiple digits?
The cathode selection signal must switch with a period shorter than the persistence time of the human eye, with 20ms chosen in the example.
From: STMicroelectronics AN842 7-Segment Display Drive Application Note
Which microcontroller is used in this clock design?
The design uses the ST62 MCU.
From: STMicroelectronics AN841 Application Note: Clock Design using ST6-REALIZER
What format is used to represent the time values?
The time values are represented in the HH:MM format.
From: STMicroelectronics AN841 Application Note: Clock Design using ST6-REALIZER