Single chip timer T0 measures external pulse time C51 program-EEWORLD

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Digital tube display circuit diagram

51 MCU program code:
#include

#define UCHAR unsigned char

#define UINT unsigned int

sbit KEY=P3^2;

UCHAR table[16] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

UINT context;

void inittime(void)

{

KEY=1;

conter=0;

TMOD=0x09;

TH0=0X00;

TL0=0X00;

EA=1;

ET0=1;

TR0=0;

}

void Delay_1ms(UCHAR i) //1ms delay

{

UCHAR x,j;

for(j=0;j

for(x=0;x<=148;x++);

}

void segdisplay(void)

{

P0 = 0; //Blanking

P2 = 4; //The 7th digital tube display

P0 = table[(conter / 10000)%10]; //Get the tens digit of i here

Delay_1ms(5); //Display the next number after 0.5 seconds delay

P0 = 0; //Blank

P2 = 5; //The 8th digital tube display

P0 = table[conter /100% 10]; //Get the unit digit of i here

Delay_1ms(5);

P0 = 0; //Blanking

P2 = 6; //The 7th digital tube display

P0 = table[(conter / 10)%10]; //Get the tens digit of i here

Delay_1ms(5); //Display the next number after 0.5 seconds delay

P0 = 0; //Blank

P2 = 7; //The 8th digital tube display

P0 = table[conter % 10]; //Get the unit digit of i here

Delay_1ms(5);

P0=0;

}

void main()

{

inittime();

while(1)

{

segdisplay();

if(KEY==1)

TR0=0;

if(KEY==0)

TR0=1;

conter=TH0*256+TL0;

}

Keywords：MCU Reference address：Single chip timer T0 measures external pulse time C51 program

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