Single chip liquid crystal display
Author:LV Ruihua Time:2021-07-19 15:43 Browse(736)
Single chip microcomputer can directly access memory and I / O through data bus and control signal
MCU can directly control the LCD module through data bus and control signal in the form of memory access and I / O device access. This paper takes W78E58 of Huabang company as an example. It is a 51 Series MCU compatible microcontroller. It has 32KB flash EEPROM in it. The program compiled by users and the English letters, numbers, Chinese characters, curves and graphics that need to be displayed can be stored in it. It avoids the trouble of expanding external memory and makes the control system circuit with W78E58 MCU as the core simpler. So it is very suitable for liquid crystal display... The interface circuit between MGLS12864 and W78E58 is shown in Figure 1. The diagram adopts direct access mode, and the single chip microcomputer controls CSA through low address A2; A3 controls CSB to gate the controller HD61202 of each area on LCD; At the same time, W78E58 uses address A1 as R / W signal to control the data flow of data bus; Address A0 is used as the choice of D / I signal control register; The e signal is generated by the combination of read signal / RD and write signal / WR of W78E58; In addition, the reset pin (9 pin) of the MCU is connected to the LCD reset pin (17 pin / RST) through the inverter. When the MCU is powered on or reset manually, the LCD is also reset; The circuit connection between W78E58 and HD61202 is realized. In the circuit, the LCD power control terminal VO is used to adjust the gray level of the display screen. Adjusting the voltage at this terminal can change the color of the characters and graphics on the display screen...
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