Make Counter use multiplexing seven segment display with microcontroller (use interrupt)

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In this tutorial we will learn how to make Counter use Timer / Counter Overflow Interrupt. Here I am use PIC16F877A Micrcocontroller and 3 digit multiplexing seven segment display. You can watch the video or read the written tutorial below.

Circuit Diagram of counter circuit

Mikro C Code For Counter:

# define SW1 PORTC.RC0
# define SW2 PORTC.RC1
char display[10] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
int i;
char digit1,digit2,digit3;
void interrupt(){
if(i==1000) i =0;
if(i==-1) i = 0;
digit1 = i/100;
digit2 = (i/10)%10;
digit3 = i%10;

PORTB = display[digit1];
PORTD = 0X01;
delay_ms(5);
PORTD = 0X00;

PORTB = display[digit2];
PORTD = 0X02;
delay_ms(5);
PORTD = 0X00;

PORTB = display[digit3];
PORTD = 0X04;
delay_ms(5);
PORTD = 0X00;

T0IF_bit = 0;
}
void main() {
TRISB = 0X00;
TRISC = 0X00;
TRISD = 0X00;
PORTB = 0X00;
PORTC = 0X00;
PORTD = 0X00;
TMR0 = 0; // Clear Timer0
OPTION_REG = 0X03;
INTCON = 0XA0;
while(1){
if(SW1==1){
i++;
delay_ms(20);
}
if(SW2==1){
i--;
delay_ms(20);
}
}

}

Click the downlaod button for Program File: