Four-digit frequency counter display design based on 51 microcontroller

Simulation schematic diagram:

Program operation chart:

Part of the program:

#include

#define uchar unsigned char

#define uint unsigned int

uchar duan[10]={0xc0,0Xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //The bit code of the required segment

//uchar wei[4]={0XEf,0XDf,0XBf,0X7f}; //bit control end (development board)

uchar wei[4]={0X80,0X40,0X20,0X10}; //bit control terminal (simulation)

uint z,x,c,v, date; //Define data type

uint dispcount=0;

uint lck=0;

uint disp=0;

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

P2=wei[3];

P0=duan[v];

delay(50);

}

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

Timer initial value 1ms

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

void initTimer(void)

{

TMOD=0x0;

TH0=0xe3;

TL0=0xc;

}

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

timer function

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

void timer0(void) interrupt 1

{

TH0=0xe3;

TL0=0xc;

lck++;

if(lck==1000)

{

disp=dispcount;

lck=0;

dispcount=0;

}

}

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

Interrupt function

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

void int0(void) interrupt 0

{

dispcount++; //for each interrupt, the count increases by one

}

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

main function

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

void main(void)

{

IT0=1; //INT0 falling edge interrupt

EX0=1; //Allow INT1 interrupt

initTimer(); //Load the initial value

TR0=1;

ET0=1;

EA=1;

while(1)

{

date=disp;

xianshi();

}

}