FAcing issue with the I2C slave receiver .

Dear All,

Facing problem with the I2C communication between HL Modem and Microcontroller to recieve GPS data, where in which Transmitter is working fine but not able to receive anythig at the receiver interrupt. below is the peice of CODE which is used for Transmitter and Receiver Initialization.

Connection type   : (I2C MASTER) HL 6528 MODEM( Seirra Wireless)   to  (I2C SLAVE) Microcontroller :MSP4305438A

Steps taken care before coding are

1. Pull up resistors are placed at the Master end of the I2C for both SDA and CLOCK

Please do suggest us is there anything wrong with the initialization.

void Master_Init_I2C( void )
{

P10SEL |= 0x06;                                                                 // Assign I2C pins to USCI_B3
UCB3CTL1 |= UCSWRST;                                               // Enable SW reset
UCB3CTL0 = UCMST + UCMODE_3 + UCSYNC;      // I2C Master, synchronous mode
UCB3CTL1 |= UCSSEL_2 + UCTR + UCSWRST;       // Use SMCLK, keep SW reset
UCB3BR0 = 12;                                                                  // fSCL = SMCLK/12 = ~100kHz
UCB3BR1 = 0;
UCB3CTL1 &= ~UCSWRST;                                          // Clear SW reset, resume operation
UCB3I2CSA = 0x48;                                                        // Slave Address is 048h
UCB3IE |= UCNACKIE + UCTXIE;                                // Enable TX interrupt

while (1)
{
_delay_cycles(50);                                             // Delay required between transaction
PTxData = (unsigned char *)TxData;             // TX array start address
TXByteCtr = sizeof TxData;                              // Load TX byte counter

UCB3CTL1 |= UCTXSTT;                                 // I2C TX, start condition
__bis_SR_register(LPM0_bits + GIE);         // Enter LPM0, enable interrupts
__no_operation();                                             // Remain in LPM0 until all data
while (UCB3CTL1 & UCTXSTP);                   // Ensure stop condition got sent // is TX'd

}

}

void Slave_Init_I2C( void )
{
P10SEL |= 0x06;                                                       // Assign I2C pins to USCI_B0
UCB3CTL0 &= ~UCMST;
UCB3CTL0 = UCMODE_3 + UCSYNC;              // I2C Slave, synchronous mode
UCB3CTL1 |= UCSWRST;                                    // Enable SW reset
UCB3CTL1 &= ~UCTR;                                        //set up as receiver
UCB3CTL1 &= ~UCSWRST;                              // Clear SW reset, resume operation
UCB3I2COA = 0x48;                                             // Own Address is 048h
UCB3IE |= UCRXIE ;                                            //+ UCSTPIE + UCSTTIE; // Enable STT, STP & RX interrupt


while (1)
{

     PRxData = (unsigned char *)RxBuffer;      // Start of RX buffer
    RXByteCtr = 0; // Clear RX byte count
   __bis_SR_register(LPM0_bits + GIE);        // Enter LPM0, enable interrupts
    // Remain in LPM0 until master
   // finishes TX
    __no_operation();                                         // Set breakpoint >>here<< and read
} // read out the RxData buffer

}

Any Suggetions would be greatly appreciated,  waiting for the responce.

Thank you,

Nithin