Advantages of PIC18F4520 and TC74

 #include <i2c.h>

#include "i2c.h"

void Call_Init_I2C (void)
{

	TRISCbits.TRISC3=1; //Set RC3 and RC4 as input
	TRISCbits.TRISC4=1;
	SSPCON1 = 0x28; // No collision/ No overflow/ SDA and SCL as serial port/ Clock stretch/ Enable I2C master mode
	SSPSTAT=0x80; // Disable slew rate control for Standard Speed mode.
	SSPADD = 119; // Set Baud rate as 100kHZ

}

void Start_I2C (void)
{
	SSPCON2bits.SEN = 1; // Enable start condition 
	while ( SSPCON2bits.SEN)Nop(); // Wait for SEN to go LOW.
}

void Send_To_Slave(unsigned char code)
{
	PIR1bits.SSPIF=0; // clear SSPIF flag
	SSPBUF = 0b10011010;   // Send TC74 ADDRESS; default is 1001101 + (0 write or 1 read)
}

void Wait_For_ACK (void)
{
	while (SSPCON2bits.ACKSTAT); // Wait for ACKSTAT to go LOW. 
	while(!PIR1bits.SSPIF)Nop(); // Wait for SSPIF flag to go HIGH.
}

void Restart_I2C(void)
{
	SSPCON2bits.RSEN = 1;  // Repeated Start Condition Enable bit
	while (SSPCON2bits.RSEN)Nop();  //Wait for RSEN to go LOW. 
}

void Switch_To_Read_Mode (void)
{
	SSPCON2bits.RCEN = 1;  // Enable Receive mode
	while ( SSPCON2bits.RCEN)Nop();  // Wait for RSEN to go LOW. 
}

unsigned char Load_From_Slave(void)
{
	unsigned char temp;
	temp = SSPBUF; // Load to "temp" variable  
	return temp;
}

void Send_NACK(void)
{
	SSPCON2bits.ACKDT = 1;// Send NOT-ACK. 
	SSPCON2bits.ACKEN = 1;
	while ( SSPCON2bits.ACKEN) Nop(); // Wait for ACKEN to go LOW. 
}

void Stop_I2C(void)
{
	SSPCON2bits.PEN = 1; // Initiate STOP condition 
	while( SSPCON2bits.PEN) Nop(); //  Wait for PEN to go LOW. 
}

unsigned char  Get_Temp_Result (void)
{
	unsigned char temp;
	//Write According to Receive Byte Format
	Start_I2C ();  //Start Condition
	Send_To_Slave(0X9A)  ;  //Send to slave 7bit Address (1001 101) + RD (1)
	Wait_For_ACK(); //Wait for ACK from slave
	Switch_To_Read_Mode(); //Switch to Read mode in order to receive from Slave
	temp = Load_From_Slave(); //Get data from Slave
	Send_NACK(); //Send NACK 
	Stop_I2C(); //Stop Condition 
	return temp;
}


void Display_In_BCD (unsigned char this_number)
{
	unsigned char First_Deci; //First Decimal //Local variables
	unsigned char Second_Deci; //Second Decimal
	unsigned char Third_Deci; //Third Decimal

	//the limit of TC74 sensor: +127 to -65 degree

	if (this_number > 127 ) //if more than 127 then go to minus range
		
	{
		this_number = 256- this_number;
		putrsLCD(45); //put minus sign
	}
		

	First_Deci = this_number/100;
	Second_Deci = (this_number /10)%10;
	Third_Deci = (this_number/1)%10	;
			
	if (First_Deci != 0){putrsLCD(First_Deci);}  //Show first digit
		
		Delay10KTCYx(10); 
		if (Second_Deci != 0 || First_Deci != 0){putrsLCD(Second_Deci);} //Show second digit
		Delay10KTCYx(10); 
		putrsLCD(Third_Deci); //Show third digit
		Delay10KTCYx(10); 
		
	
}
void Call_Init_USART()
{
		OpenUSART( USART_TX_INT_OFF & 
		USART_RX_INT_OFF &
		USART_ASYNCH_MODE &
		USART_EIGHT_BIT &
		USART_CONT_RX &
		USART_BRGH_HIGH,	
		25); //Bit per second:9600 / Data bit: 8 / Partiy bit : None / Stop bit : 1 / Flow control : None
}


void initLCD(void)
{
	TRISD = 0x00;
	PORTDbits.RD7 = 1;  //Power On LCD
	OpenXLCD(FOUR_BIT & LINES_5X7);
	putrsLCD((const far rom char*)"Initializing LCD...");
	
	while (1)			// run forever; infinite loop
	{  
               
		data= Get_Temp_Result (); //Get Result from TC74
		Display_In_BCD (data); //Display Temperature result in BCD (then convert to ASCII code)
		putrsLCD(32); //space 
		putrsLCD(32); //space
		Delay10KTCYx(100); // one second delay
	}
}