Multi-level LCD display Chinese menu based on 51 single chip microcomputer

Overview:
This paper introduces a method of realizing multi-level Chinese menu operation by paging principle based on the YM12864 LCD display which is widely used and controlled by AT89C51 single chip microcomputer. The main technical parameters, display characteristics and core programs of YM12864 are given. The designed Chinese menu has certain versatility. It can be applied to household appliances, instruments and other equipment by simply changing the menu items, providing operators with a friendly and convenient Chinese operation interface.


I. Introduction
At present, small displays mainly include LCD and LED. LED display can only display numbers and a limited number of English characters, but not Chinese characters. The display content is not intuitive, and operators can only understand the display content according to the agreed format. LCD can display various Chinese characters and graphics, especially Chinese menu display, providing operators with a convenient and friendly operation interface, and low power consumption, so LCD is widely used. Now there are many LCDs with Chinese character libraries on the market, with moderate prices, and most of them have a unified standard interface with MCU, which provides great convenience for using LCD to realize Chinese menu operation. I believe that if more electronic products improve their performance while designing more user-friendly Chinese menu interaction interfaces, the products will have broader prospects.

       
2. Introduction of YM12864 LCD Module
YM12864 Chinese character graphic dot matrix LCD module can display Chinese characters and graphics, with built-in 8192 Chinese characters (16X16 dot matrix), 128 characters (8X16 dot matrix) and 64X256 dot matrix display RAM (GDRAM).

Main technical parameters and display characteristics:
Power supply: VDD 3.3V~+5V (built-in boost circuit, no negative pressure required) Display content: 128 columns × 64 rows Interface with MCU: 8-bit or 4-bit parallel/3-bit serial Multiple software functions: cursor display, screen shift, custom characters, sleep mode, etc.
Its pin function is a universal 20-pin LCD interface, and the user instruction set is also a universal 128*64LCD user instruction set, and relevant information is easy to obtain. Because it has a built-in Chinese character library, it saves the workload of creating a character library by itself, and only needs to write the corresponding Chinese characters and character internal codes to display the required Chinese characters and characters, which is easy to implement in many program development software, such as: WAVE, KEIL, etc. Therefore, it will be easier to use an LCD with Chinese character library to implement Chinese menu operation.