Pic Microcontroller Slave and Master

#include <system.h>

#pragma CLOCK_FREQ   16000000
#pragma DATA _CONFIG1, _HS_OSC & _MCLRE_ON & _WDT_OFF
#pragma DATA _CONFIG2, _WRT_1FOURTH & _BOR21V

// Test I2C in Slave mode with mask address register. 


// I2C Addresses and Commands
#define I2C_ADDRESS 0xA8

void interrupt (void)
 { if (pir1.SSPIF) 
    { portc.7 = pir1.SSPIF;      // mirror the SSPIF state. 
      portc.7 = pir1.SSPIF=0;
      portc.6 = sspstat.BF;
      if (sspstat.S & sspstat.BF) 
         // Slave receives address/data after start
         portb = sspbuf;
      
      portc.6 = sspstat.BF;
    } 
 }

void main()
 { portc.7  = 0;
   portc.6  = 0;
   trisc.3  = 1;  // SCL as inputs (release bus)
   trisc.4  = 1;	// SDA as inputs (release bus)
   trisc.6  = 0;  // used to flag BF bit
   trisc.7  = 0;  // used to mirror the state of SSPIF
   portb    = 0;
   trisb    = 0;   
   // Make low nibble bits as "don't care" bit address.
   // This register *must be* initiated prior to setting SSPM<3:0> bits to select the I2C Slave mode (7-bit or 10-bit address). 
   // Note that SSPMASK coincides with SSPADD and that we should write SSPCON with 0b1001 in order to have access to it. 
   sspcon.SSPM0 = 1;
   sspcon.SSPM1 = 0;
   sspcon.SSPM2 = 0;            
   sspcon.SSPM3 = 1;
   sspadd = 0xF0;
   // Activate I2C, Slave mode, 7Bit, with Start/Stop bit interrupt 
   sspcon.SSPM0 = 0;   
   sspcon.SSPM1 = 1;
   sspcon.SSPM2 = 1;            
   sspcon.SSPM3 = 1;
   // SSPSTAT Status Register
   sspstat.SMP  = 0;	      // Slewrate Control disabled
   sspstat.CKE  = 0;	      // SMBUS specific inputs disabled
   // CKP, Release Clock
   sspcon.CKP   = 1;
   // Disable Address 0x0 General Call
   sspcon2.GCEN = 1;
   // Disable clock stretching
   sspcon2.SEN  = 0;	
   // Set I2C Slave address 
   sspadd = I2C_ADDRESS;	
   // Synchronous Serial Port Enable
   sspcon.SSPEN  = 1;	
   // dummy read clears BF
   unsigned int dummy = sspbuf;         
   // Clear Buffer Overflow
   sspcon.SSPOV = 0;	      
   // Receive Enable
   sspcon2.RCEN = 1;       
   // Enable Global,  Peripheral and SSP module interrupts
   intcon.GIE   = 1;       
   intcon.PEIE  = 1;       
   pie1.SSPIE   = 1;	      
  
   // do it forever   
   while(1) ;
 }