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cc3200 spi 时钟设置问题

Other Parts Discussed in Thread: CC3200

请问 cc3200的spi时钟设置是否是通过

MAP_SPIConfigSetExpClk(GSPI_BASE,MAP_PRCMPeripheralClockGet(PRCM_GSPI),
                                                  SPI_IF_BIT_RATE,SPI_MODE_MASTER,SPI_SUB_MODE_0,
                                                  (SPI_SW_CTRL_CS |
                                                   SPI_4PIN_MODE |
                                                   SPI_TURBO_OFF |
                                                   SPI_CS_ACTIVEHIGH |  
                                                   SPI_WL_16));

中的SPI_IF_BIT_RATE来设置的,具体是怎么计算的?最大是否为20MHz?