MSP430F67751A: MSP430f67751A SPI clock

Hi, 

I  am using MSP430F67751A and CC2520 RF radio for my project.  MSP430F67751A and CC2520 are connected over SPI. when checked for the SPI clock frequency it shows 1MHz.

Below is the current configuration:

UCA0CTLW0 |= UCMST | UCSYNC | UCCKPL | UCMSB;

UCA0CTLW0 |= UCSSEL_2; 

UCA0BRW_L = 0x03;

UCA0BRW_H = 0;  

UCA0MCTLW = 0; 

How can i increase  the SPI clock. Please share some example codes if any, to achieve SPI clock 8MHz using the above configuration.