Interfacing the 74HC595 shift registers with PIC16F887 digital pins - https://aki-technical.blogspot.com/2020/05/interfacing-74hc595-shift-registers.html

pic16f887Sn74hc595nXc8.c

#include<xc.h>
// PIC16F887 Configuration Bit Settings
// CONFIG1
#pragma config FOSC = XT
#pragma config WDTE = OFF
#pragma config PWRTE = OFF
#pragma config MCLRE = ON
#pragma config CP = OFF
#pragma config CPD = OFF
#pragma config BOREN = ON
#pragma config IESO = ON
#pragma config FCMEN = ON
#pragma config LVP = ON
// CONFIG2
#pragma config BOR4V = BOR40V
#pragma config WRT = OFF
#define _XTAL_FREQ 4000000
void shiftOut(char pattern){
    /*RE0.2 AS OUTPUT*/
    PORTE=0x00;
    TRISE=0x00;
    ANSEL=0x00;
    //RE2=0;
    for(int i=0;i<8;i++){
        RE0=0;
        RE1=((pattern&0x80)!=0)?1:0;
        RE0=1;
        pattern<<=1;
        for(int k=0;k<100;k++);
    }
    //RE2=1;
}
void main(){
    char ssd[16]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,
    0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71};
    unsigned int myTime=0;
   
    while(1){
        RE2=0;
        shiftOut(ssd[myTime%10]);
        shiftOut(ssd[myTime/10]);
        RE2=1;
        myTime+=1;
        if(myTime>=60)
            myTime=0;
        __delay_ms(1000);
    }
}