MSP430FR5869: Master SPI configuration

Part Number: MSP430FR5869

Hi, 

I am trying to use MSP430FR5869 as SPI master. I am configuring UCB0 port for MISO and MOSI data transfer. I have followed sample code given below

int main(void)
{
  WDTCTL = WDTPW | WDTHOLD;                 // Stop watchdog timer

  // Configure GPIO
  P1SEL1 |= BIT5;                           // Configure SPI pins
  P2SEL1 |= BIT0 | BIT1;
  PJSEL0 |= BIT4 | BIT5;                    // For XT1

  // Disable the GPIO power-on default high-impedance mode to activate
  // previously configured port settings
  PM5CTL0 &= ~LOCKLPM5;

  // XT1 Setup
  CSCTL0_H = CSKEY >> 8;                    // Unlock CS registers
  CSCTL1 = DCOFSEL_0;                       // Set DCO to 1MHz
  CSCTL1 &= ~DCORSEL;
  CSCTL2 = SELA__LFXTCLK | SELS__DCOCLK | SELM__DCOCLK;
  CSCTL3 = DIVA__1 | DIVS__1 | DIVM__1;     // Set all dividers
  CSCTL4 &= ~LFXTOFF;
  do
  {
    CSCTL5 &= ~LFXTOFFG;                    // Clear XT1 fault flag
    SFRIFG1 &= ~OFIFG;
  }while (SFRIFG1&OFIFG);                   // Test oscillator fault flag
  CSCTL0_H = 0;                             // Lock CS registers

  // Configure USCI_A0 for SPI operation
  UCA0CTLW0 = UCSWRST;                      // **Put state machine in reset**
  UCA0CTLW0 |= UCSYNC | UCCKPL | UCMSB;     // 3-pin, 8-bit SPI slave
                                            // Clock polarity high, MSB
  UCA0CTLW0 |= UCSSEL__SMCLK;               // ACLK
  UCA0BR0 = 0x02;                           // /2
  UCA0BR1 = 0;                              //
  UCA0MCTLW = 0;                            // No modulation
  UCA0CTLW0 &= ~UCSWRST;                    // **Initialize USCI state machine**
  UCA0IE |= UCRXIE;                         // Enable USCI_A0 RX interrupt

  __bis_SR_register(LPM0_bits | GIE);       // Enter LPM0, enable interrupts
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)
#else
#error Compiler not supported!
#endif
{
  while (!(UCA0IFG&UCTXIFG));               // USCI_A0 TX buffer ready?
  UCA0TXBUF = UCA0RXBUF;                    // Echo received data
}

I did not include the highlight section in my code because I do not need to configure clock as I will be using default SMCLK. However when I test the program there are no output on MOSI pin. Do I have to include the clock configuration section in order for SPI master to work? Thank you.