"单片机系统中常用的 LED 和 LCD 显示器及接口应用"

LESSON3 introduces the static display of digital tubes, as well as the application of timers and interrupts. In the provided PowerPoint presentation, various types of display devices commonly used in microcontroller systems are discussed. These include Light Emitting Diode (LED) displays, Liquid Crystal Display (LCD) displays, and Cathode Ray Tube (CRT) displays. LED and LCD displays are characterized by two main types of display structures: segment display (such as 7-segment and dot-matrix) and dot matrix display (such as 5x8 and 8x8 dot matrix). When using an LED display, it is important to differentiate between these two different wiring methods. In order to display numbers or characters, encoding must be performed. A seven-segment digital tube, along with a decimal point, consists of a total of 8 segments. Therefore, the encoding provided for LED displays corresponds to one byte. The TX experimental board uses a common cathode LED display. The coding for displaying hexadecimal numbers is outlined in the table provided in the presentation. The table shows the segment connections for both common cathode and common anode displays. The encoding for numbers 0 to 7 in hexadecimal format is listed as follows: 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, and 0x7d. This lesson emphasizes the importance of understanding the different types of display devices and their corresponding encoding schemes. It also delves into the practical application of timers and interrupts in controlling and updating the display content. By gaining a clear understanding of these concepts, students can effectively utilize various display devices in microcontroller systems for a wide range of applications.