51 MCU-LCD 1602-EEWORLD

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Liquid crystal is a polymer material. The main principle of liquid crystal display is that electric current stimulates liquid crystal molecules to produce points, lines, and surfaces and cooperates with the back light tube to form a picture. For the sake of simplicity, all kinds of liquid crystal displays are directly called liquid crystal. Various types of liquid crystals are usually named according to the number of rows of displayed characters or the number of rows and columns of liquid crystal dot matrix. For example: 1602 means that 16 characters are displayed per line, and a total of two lines are displayed; similar names include 0801, 0802, 1601, etc. This type of liquid crystal is usually a character liquid crystal, that is, it can only display ASCII code characters, such as numbers, uppercase and lowercase letters, various symbols, etc. 12232 liquid crystal belongs to graphic liquid crystal, which means that the liquid crystal consists of 122 columns and 32 rows. Liquid crystal is small in size, low in power consumption, and simple in display operation, but it has a fatal weakness, and its operating temperature range is very narrow.

Initial setup:

RAM address map:

Write operation timing:

To achieve two-line display, slide from left to right.

#include

#define uchar unsigned char

#define uint unsigned int

sbit RS = P1^0;

sbit RW = P1^1;

sbit E = P1^2;

uint i;

uchar code table[] = "I LOVE MCU!";

uchar code table1[]="WWW.TXMCU.COM";

void delay(uint t){

int i,j;

for(i = 0; i < t; i++)

for(j = 200; j > 0; j--)

;

}

void lcd_com(uchar s){

RS = 0; //Low level, write instruction

P2 = s; //Transfer data

delay(14); //Look at the timing diagram, the data needs to be stable for a while

E = 1; //Give a high pulse to send a command

delay(14); //As shown in the figure, the high pulse is delayed for a period of time to ensure that the command is sent

E = 0; //Send is finished, E is set to low level

}

void lcd_data(uchar s){

RS = 1;

P2 = s;

delay(14);

E = 1;

delay(14);

E = 0;

}

void init(){

RS = 1; //First send command, at the initial moment RS is high, E and RW are low

E = 0;

RW = 0;

lcd_com(0x38); //Set to 16*2 display, 5*7 dot matrix, 8-bit data interface

lcd_com(0x0f); //Turn on the display, display the cursor, and the cursor flashes

lcd_com(0x06); //Address pointer plus one after reading or writing a character

lcd_com(0x01);

lcd_com(0x80+0x10); //The display screen corresponds to a RAM, and there is another RAM outside the screen

for(i = 0; i ＜ 11; i++){ //Set the address to the off-screen RAM to achieve the scrolling effect

RS = 0;

lcd_data(table[ i]);

delay(40);

}

lcd_com(0x80+0x50);

for(i = 0; i ＜ 13; i++){

RS = 0;

lcd_data(table1[ i]);

delay(40);

}

for(i = 0; i ＜ 13; i++){

lcd_com(0x18); //0x18, move the display to the left, and the cursor moves with it

delay(200);

}

void main(){

init();

while(1);

}

Reference address：51 MCU-LCD 1602

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