STC89C52 microcontroller digital tube dynamic display

Digital tube dynamic display

Static and dynamic display

dynamic display

The characteristic of dynamic display is that the segment selection lines of all digital tubes are connected in parallel, and the bit selection lines control which digital tube is effective. The selected digital tube adopts dynamic scanning display. The so-called dynamic scanning display is to send glyph codes and corresponding bit selections to each digital tube in turn. It uses the afterglow of the luminescent tube and the persistence of human vision to make people feel as if all the digital tubes are displaying at the same time.

Array definition and reference

An array is a collection of ordered data, and each data in the array is of the same data type. Elements in an array can be uniquely identified by the array name and subscript.

The general format of an array is defined as follows:

Data type array name [constant expression] = {element list};

For example:

unsigned char tabel[3] = [0x3F, 0x06, 0x5B,];

P0 = tabel[0]; //The value of P0 at this time is 0x3F

Digital tube dynamically displays the number 123

#include

#include

#define uint unsigned int

#define uchar unsigned char

sbit DU = P2^6;//digital tube segment selection

sbit WE = P2^7;//Nigital tube segment selection

// Millisecond delay function definition

void delay(uint z){ // Millisecond delay function definition

uint x, y;

for (x = z; x > 0; x--){

for (y = 114; y > 0; y--){

}

}

}

void main(){ // The main function itself will loop

while(1){

/*The first digit displayed is 1*/

    P0 = 0XFF; // Clear the broken code.   If the value 0XFF is not initialized for P0, then the value of P0 will be the value assigned in the previous process of opening the segment selection latch. When executed here, the segment selection value will be assigned to P0 in the latch. , causing the digital tube to display errors.

WE = 1; //Open bit select latch

P0 = 0XFE; // 1111 1110 strobe the first digital tube

// P0 = 0X00; // 0000 0000 means strobing all digital tubes

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = 0X06; // 0000 0110 displays "1"

DU = 0; //Latch segment selection data

delay(5); // Perform a 5 millisecond delay operation for each digital tube switching

/*The second digit displays number 2*/

  P0 = 0XFF; // Clear break code

WE = 1; //Open bit select latch

P0 = 0XFD; // 1111 1101 strobe the second digital tube

// P0 = 0X00; // 0000 0000 means strobing all digital tubes

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = 0X5B; // 0101 1011 displays "2"

DU = 0; //Latch segment selection data

delay(5);

/*The third digit displays the number 3*/

P0 = 0XFF; // Clear break code

WE = 1; //Open bit select latch

P0 = 0XFB; // 1111 1011 strobe the third digital tube

// P0 = 0X00; // 0000 0000 means strobing all digital tubes

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = 0X4F; // 0100 1111 displays "3"

DU = 0; //Latch segment selection data

delay(5);

}

}

Digital tube dynamically displays the number 123 (code optimization)

#include //Includes 51 header file

#include //Includes the shift standard library function header file

#define uint unsigned int

#define uchar unsigned char

sbit DU = P2^6;//digital tube segment selection

sbit WE = P2^7;//Nigital tube segment selection

//Common cathode digital tube segment selection table 0-9

uchar code tabel[]= {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F,};

/*====================================

Function : delay(uint z)

Parameter : z delay millisecond setting, value range 0-65535

Return value : None

Description : 12T/Fosc11.0592M millisecond delay

====================================*/

void delay(uint z)

{

uint x,y;

for(x = z; x > 0; x--)

for(y = 114; y > 0; y--);

} 

/*====================================

Function : display(uchar i)

Parameter : i displays the numerical value, the value range is 0-255

Return value : None

Description : Three-digit common cathode digital tube dynamic display

====================================*/

void display(uchar i)

{

uchar bai, shi, ge;

bai = i / 100; //236 / 100 = 2

shi = i % 100 / 10; //236 % 100 / 10 = 3

ge = i % 10;//236 % 10 =6

//The first digital tube 

P0 = 0XFF;//Clear broken code

WE = 1;//Open bit selection latch

P0 = 0XFE; //1111 1110

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[bai];//

DU = 0; //Latch segment selection data

delay(5);

//The second digital tube

P0 = 0XFF;//Clear broken code

WE = 1;//Open bit selection latch

P0 = 0XFD; //1111 1101

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[shi];//

DU = 0; //Latch segment selection data

delay(5);

//The third digital tube

P0 = 0XFF;//Clear broken code

WE = 1;//Open bit selection latch

P0 = 0XFB; //1111 1011

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[ge];//

DU = 0; //Latch segment selection data

delay(5);

}

void main()//main function itself will loop

{

while(1)

{

display(123); //Nigital tube display function

}

}  

The digital tube dynamically displays the number 12345678 (code optimization)

#include //Includes 51 header file

#include //Includes the shift standard library function header file

#define uint unsigned int

#define uchar unsigned char

sbit DU = P2^6;//digital tube segment selection

sbit WE = P2^7;//Nigital tube segment selection

//Common cathode digital tube segment selection table 0-9

uchar code tabel[]= {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F,};

/*====================================

Function : delay(uint z)

Parameter : z delay millisecond setting, value range 0-65535

Return value : None

Description : 12T/Fosc11.0592M millisecond delay

====================================*/

void delay(uint z)

{

uint x,y;

for(x = z; x > 0; x--)

for(y = 114; y > 0; y--);

} 

/*====================================

Description : Eight-bit common cathode digital tube dynamic display

====================================*/

void display(uchar num1, uchar num2, uchar num3, uchar num4, uchar num5, uchar num6, uchar num7, uchar num8)

{

/*Display the first position*/

P0 = 0XFF;//Clear broken code

WE = 1;//Open bit selection latch

P0 = 0XFE; //1111 1110

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[num1];//

DU = 0; //Latch segment selection data

delay(1);

/*The second digit is displayed*/

P0 = 0XFF;//Clear broken code

WE = 1;//Open bit selection latch

P0 = 0XFD; //1111 1101

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[num2];//

DU = 0; //Latch segment selection data

delay(1);

/*The third digit is displayed*/

P0 = 0XFF;//Clear broken code

WE = 1;//Open bit selection latch

P0 = 0XFB; //1111 1011

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[num3];//

DU = 0; //Latch segment selection data

delay(1);

/*The fourth digit is displayed*/

P0 = 0XFF; // Clear break code

WE = 1; //Open bit select latch

P0 = 0XF7; // 1111 0111 strobe the fourth digital tube

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[num4];//

DU = 0; //Latch segment selection data

delay(1);

/*fifth digit display*/

P0 = 0XFF; // Clear break code

WE = 1; //Open bit select latch

P0 = 0XEF; // 1110 1111 strobe the fifth digital tube

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[num5];//

DU = 0; //Latch segment selection data

delay(1);

/*The sixth digit is displayed*/

P0 = 0XFF; // Clear break code

WE = 1; //Open bit select latch

P0 = 0XDF; // 1101 1111 strobe the sixth digital tube

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[num6];//

DU = 0; //Latch segment selection data

delay(1);

/*The seventh digit is displayed*/

P0 = 0XFF; // Clear break code

WE = 1; //Open bit select latch

P0 = 0XBF; // 1011 1111 strobe the seventh digital tube

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[num7];//

DU = 0; //Latch segment selection data

delay(1);

/*Eighth digit display*/

P0 = 0XFF; // Clear break code

WE = 1; //Open bit select latch

P0 = 0X7F; // 0111 1111 strobes the eighth digital tube

WE = 0; //Latch bit selection data

DU = 1; //Open segment selection latch

P0 = tabel[num8];

DU = 0; //Latch segment selection data

delay(1);

}

void main()//main function itself will loop

{

while(1)

{

display(1, 2, 3, 4, 5, 6, 7, 8); //Nigital tube display function

}

}