Single chip real-time clock circuit (LCD1602, PCF8563)

1. Introduction

This circuit mainly consists of 51 single chip microcomputer, LCD1602 module, PCF8563 chip and buttons. The current time is displayed through LCD1062, and the time can be set by buttons.

2. Operation Effect

3. Partial Code

/*Want more projects private wo!!!*/

#include

#include

#define uchar unsigned char

#define uint unsigned int

void init()

{

flying number;

lcden=0;

write_com(0x38); //0011 1000B, function mode setting, set to 8 as data port, two-line display, 5*7 dot matrix

write_com(0x0c); //0000 1011B, display on and cursor setting, display off, display cursor, cursor flashing

write_com(0x06); //0000 0110B, display cursor movement setting, read or write a character, the address pointer decreases by one and the cursor decreases by one, write a character and the screen display does not move

write_com(0x01); //0000 0001B, clear the display, data pointer and all displays

write_com(0x80); //1000 000B, turn off display

delay1602(5);

write_com(0x80); //1000 000B, set to 2 lines display, write the address of the first line of characters, the first line address is 00-2F

for(num=0;num<15;num++)

{

write_date(table[num]); //Write the first row of data

delay1602(5);

}

write_com(0x80+0x40); //1100 0000B, set to 2 lines of display, write the address of the second line of characters, the address of the second line is 40-67

for(num=0;num<15;num++) //Write the second line of data

{

write_date(table1[num]); //Write the second row of data

delay1602(5);

} 

}

/********************************************

Read time into internal buffer ---- external call 

********************************************/

void P8563_gettime()

{

    P8563_Read();

    if(g8563_Store[0]==0)

      P8563_Read(); /*If seconds = 0, read again to prevent time changes*/

}

//---Main function---//

void main()

{

P8563_init();

heat();

while(1)

{

P8563_gettime();

BCD_16( );

display();

key_scan(); 

  }

}