AT89C51 LCD Interfacing

Print single Character on lcd 16x2

To interface the AT89C51 with the 16x2 LCD, you'll need to write a program in a suitable programming language such as C or assembly language. Here's a simplified example in C -

#include <reg51.h>  // Include AT89C51 Register Definitions
#define LCD_DATA P2    // Port for LCD data lines
sbit RS = P0^7;        // Register Select pin
sbit RW = P0^6;        // Read/Write pin
sbit E = P0^5;         // Enable pin

void delay_ms(unsigned int ms) {
    unsigned int i, j;
    for (i = 0; i < ms; i++) {
        for (j = 0; j < 1275; j++); // Adjust this value for the desired delay
    }
}

void LCD_Command(unsigned char cmd) {
    LCD_DATA = cmd;  // Send command to data pins
    RS = 0;          // Set RS low for command mode
    RW = 0;          // Set RW low for write operation
    E = 1;           // Enable pulse high
    delay_ms(5);     // Provide some delay
    E = 0;           // Enable pulse low
}

void LCD_Init() {
    LCD_Command(0x38);  // Initialize LCD for 8-bit, 2-line, 5x8 font mode
    LCD_Command(0x0C);  // Display on, cursor off
    LCD_Command(0x01);  // Clear display
    LCD_Command(0x80);  // Set cursor position to line 1, column 1
}

void LCD_WriteChar(unsigned char ch) {
    LCD_DATA = ch;    // Send character to data pins
    RS = 1;           // Set RS high for data mode
    RW = 0;           // Set RW low for write operation
    E = 1;            // Enable pulse high
    delay_ms(5);      // Provide some delay
    E = 0;            // Enable pulse low
}

void main() {
    LCD_Init();               // Initialize LCD
    LCD_WriteChar('A');       // Display a single character
    while (1) {}              // Infinite loop
}