TC74 which is temperature sensor

#include <htc.h>
#define _XTAL_FREQ 4000000 // 4 MHz clock 

__CONFIG(0X3F39);
//#define LCD_EN RB3
//#define	LCD_RS RB5
//#define	LCD_RW RB4
#define LCD_EN RB1
#define	LCD_RS RB0
#define LCD_DATA	PORTD
#define	LCD_STROBE  LCD_EN = 1; __delay_ms(1); LCD_EN=0;
unsigned char time [6] = {"Time:"};
unsigned char date [6] = {"Date:"};
unsigned char I2CData[]= {0xff,0xff,0x40,0x03,0x04,0x05,0x06,0x07};
unsigned I2CInitval  []= {0x57,0x59,0x8,0x29,0x29,0x20,0x12,0x20};
unsigned char tmp;
unsigned char i;
unsigned char b;

void I2CWait(){
        while ( ( SSPCON2 & 0x1F ) || ( SSPSTAT & 0x04 ) );		/* wait for any pending transfer */

}

void I2CInit(void){
        TRISC3 = 1;      	/* SDA and SCL as input pin */
        TRISC4 = 1;      	/* these pins can be configured either i/p or o/p */
        SSPSTAT |= 0x80; 	/* Slew rate disabled */
        SSPCON = 0x28;   	/* SSPEN = 1, I2C Master mode, clock = FOSC/(4 * (SSPADD + 1)) */
        SSPADD = 0x28;    	/* 100Khz @ 4Mhz Fosc */
}

void I2CStart(){
		I2CWait(); 
        SEN = 1;         	
        while(SEN);      	
                    	
}

void I2CStop(){
        PEN = 1;         	/* Stop condition enabled */
        while(PEN);      	/* Wait for stop condition to finish */
                     		/* PEN automatically cleared by hardware */
}

void I2CRestart(){
        RSEN = 1;        	/* Repeated start enabled */
        while(RSEN);     	/* wait for condition to finish */
}

void I2CAck(){
        ACKDT = 0;       	/* Acknowledge data bit, 0 = ACK */
        ACKEN = 1;       	/* Ack data enabled */
        while(ACKEN);    	/* wait for ack data to send on bus */
}

void I2CNak(){
        ACKDT = 1;       			/* Acknowledge data bit, 1 = NAK */
        ACKEN = 1;       			/* Ack data enabled */
        while(ACKEN);    			/* wait for ack data to send on bus */
}



void I2CSend(unsigned char dat){
	
        SSPBUF = dat;    			/* Move data to SSPBUF */
        while(BF);       			/* wait till complete data is sent from buffer */
        I2CWait();       			/* wait for any pending transfer */
}

unsigned char I2CRead(void){
		I2CWait(); 					/* Reception works if transfer is initiated in read mode */
        RCEN = 1;        			/* Enable data reception */
        while(!BF);      			/* wait for buffer full */
        return SSPBUF;   			/* Read serial buffer and store in temp register */
        	     					/* wait to check any pending transfer */	     
}

void lcddata(unsigned char value)
	{
LCD_RS = 1; 
LCD_DATA= (value&0xf0);
LCD_STROBE;
LCD_DATA = ((value<<4)&0xf0);
LCD_STROBE;
__delay_ms(10);
	}

void lcdcmd(unsigned char value)
	{
LCD_RS = 0;
LCD_DATA= (value&0xf0);
LCD_STROBE;
LCD_DATA = ((value<<4)&0xf0);
LCD_STROBE;
__delay_ms(10);
	}
void bcdToascii(unsigned char value){

	tmp = value;
	tmp = tmp & 0xf0;
	tmp = tmp >> 4;
	tmp = tmp | 0x30;
	lcddata(tmp);
	tmp = value;
	tmp = tmp & 0x0f;
	tmp = tmp | 0x30;
	lcddata(tmp);

}

void display (){
lcdcmd(0x80);
for (char i=0;i<5;i++)
			{
		lcddata(time[i]);
			}
	bcdToascii(b);
	//bcdToascii(b);


}
void lcd_init(){

TRISD	= 0;
TRISB	= 0;
TRISC6  = 0;
TRISC5  = 0;
LCD_EN =0;
 __delay_us(10);  
	LCD_DATA =0X30;
     	LCD_STROBE;
       	__delay_ms(2);

       LCD_RS=0;
       __delay_us(10);  
	LCD_DATA =0X30;
     	LCD_STROBE;
	__delay_ms(2);

        LCD_RS=0;
       __delay_us(10);  
	LCD_DATA =0X30;
       	LCD_STROBE;
	__delay_ms(2);

       LCD_RS=0;
       __delay_us(10);  
	LCD_DATA =0X20;
     	LCD_STROBE;
	__delay_ms(2);

lcdcmd(0x28);
__delay_ms(15);
lcdcmd(0x01);
__delay_ms(10);
lcdcmd(0x06);
__delay_ms(10);
lcdcmd(0x80);
__delay_ms(10);
lcdcmd(0x0c);
__delay_ms(10);
				}
void I2Cwrite(){
		I2CStart();
		I2CSend(0x9A);
		I2CSend(0x00);
		I2CSend(0x23);
		I2CStop();
		
}

void I2Cread(){
        I2CStart();
		I2CSend(0x9A);											       						       
        I2CSend(0x00);							
        I2CRestart();
        I2CSend(0x9B);						
      	b = I2CRead();										            	 
		I2CAck();
		I2CStop();						
}


void main(){        
        I2CInit();
        lcd_init();       
		I2Cwrite();
		
while(1){
		
        I2Cread();			
		display();
	
}
}

void I2Cwrite(){
		I2CStart();
		I2CSend(0x9A);
		I2CSend(0x00);
		I2CSend(0x23);
		I2CStop();
		
}

void I2Cread(){
        I2CStart();
		I2CSend(0x9A);											       						       
        I2CSend(0x00);							
        I2CRestart();
        I2CSend(0x9B);						
      	b = I2CRead();										            	 
		I2CAck();
		I2CStop();						
}

#define		TC74_READ	   0x9B
#define		TC74_WRITE	   0x9A  


///////////////////////////////////////////////////
void tc74_init()
{
i2c_init();
__delay_ms(10);
i2c_start(); 
i2c_write(TC74_WRITE);    
i2c_write(0X01);  
i2c_write(0); 
i2c_stop();  
}
//////////////////////////////////////////////////////////////
void tc74_write(unsigned char reg,unsigned char val)
{
i2c_start(); 
i2c_write(TC74_WRITE);    
i2c_write(reg);  
i2c_write(val); 
i2c_stop(); 
}  
//////////////////////////////////////////////////////////////
void tc74_read(unsigned char reg,unsigned char *value)
{
i2c_start();
i2c_write(TC74_WRITE);
i2c_write(reg); 
i2c_repStart();
i2c_write(TC74_READ);
*value=i2c_read(0);  //ACK 
i2c_stop();   
}