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怎样操作5501的FSX引脚控制从设备的选通与否

我用5501的McBSP1接口与射频芯片SX1257连接,5501的FSX1引脚接SX1257的片选信号,想请教一下怎样设置FSX引脚为高电平或者低电平从而选通SX1257芯片。另,我已将寄存器的FSXM和FSXP位都设成了1,让FSX为输出并且低电平有效。