This article describes the principles and operation of a 7-segment display driven by the ST6-REALIZER. A 7-segment display consists of 7 LEDs arranged in a figure-eight pattern to display alphanumeric characters. The article also discusses hardware considerations and describes how to generate control software using the ST6-REALIZER.
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.
The refresh frequency must be at least 20 cycles per second to ensure image persistence and avoid flicker.
The cathode selection signal must switch with a period shorter than the persistence time of the human eye, with 20ms chosen in the example.