PIC16F877-DS1620-Includes

#include <xc.h>
#include <stdio.h>
#include <string.h>

#define _XTAL_FREQ 20000000

// Configuration bits
#pragma config FOSC = HS     // High-speed oscillator
#pragma config WDTE = OFF    // Watchdog Timer disabled
#pragma config PWRTE = OFF   // Power-up Timer disabled
#pragma config BOREN = OFF   // Brown-out Reset disabled
#pragma config LVP = ON      // Low-Voltage Programming enabled
#pragma config CPD = OFF     // Data EEPROM Code Protection disabled
#pragma config WRT = OFF     // Flash Program Memory Write Protection disabled
#pragma config CP = OFF      // Flash Program Memory Code Protection disabled

// LCD control pins
#define RS PORTCbits.RC3
#define RW PORTCbits.RC4
#define EN PORTCbits.RC5

// DS1620 pins
#define DQ PORTCbits.RC0
#define DQ_TRIS TRISCbits.TRISC0
#define CLK PORTCbits.RC1
#define RST PORTCbits.RC2

// DS1620 Commands
#define START_CONVERT  0xEE
#define STOP_CONVERT   0x22
#define READ_TEMP      0xAA
#define WRITE_CONFIG   0x0C
#define READ_CONFIG    0xAC

// Global variables
static char temp_str[16];