Interfacing the 74HC595 shift registers with PIC16F887 digital pins

The 74HC595 shift registers is a serial in parallel out shift register type. We just use three digital pins to send the data the register. Using these three wires could drive multiple of this IC.

For more detail about 74HC595, please see this post.

In this example I use two registers to show a timing of 60 seconds.

x2

x1.5

x1

x0.5

00:00 / 00:00

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Schematic diagram

Source code is here:

	#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);
	}
	}

view raw pic16f887Sn74hc595nXc8.c hosted with ❤ by GitHub

A screen shot while the simulation shows 17 seconds count.

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