MSP430G2 SPI 16bit configuration

#include <msp430g2452.h>

void main(void)
{
 WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
 P1OUT = 0;
 P1DIR |= 0x03;
 USICTL0 |= USIPE7 + USIPE5 + USIMST + USIOE; // Port, SPI master
 USICTL1 |= USIIE; // Counter interrupt, flag remains set
 USICKCTL = USIDIV_2 + USISSEL_2; // /4 SMCLK
 USICTL0 &= ~USISWRST; // USI released for operation
 USICNT = 8; // init-load counter
 _BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
}

// USI interrupt service routine
#pragma vector=USI_VECTOR
__interrupt void universal_serial_interface(void)
{
 P1OUT |= 0x02; // Disable TLC549
 if (USISRL > 0x7F)
 P1OUT |= 0x01;
 else
 P1OUT &= ~0x01;
 P1OUT &= ~0x02; // Enable TLC549
 USICNT = 8; // re-load counter
}