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TMS320F280049C: GPIO18的配置问题

Part Number: TMS320F280049C

关于GPIO18/X2的配置问题:GPIO18仅在内部晶振INTOSC2且X1下拉时,才能有GPIO功能,所以我在Initsysctrl()中将InitSysPll(XTAL_OSC,IMULT_10,FMULT_0,PLLCLK_BY_1);改成(INT_OSC2,IMULT_10,FMULT_0,PLLCLK_BY_1);随后我将GPIO18的GPyGMUXn.GPIOz和GPyMUXn.GPIOz register bits都配置为5(即EPWM6功能),之后就是对EPWM6进行相应配置;然而,GPIO18端口(即引脚32)在示波器上始终为低电平,无法驱动我的MOS管。请问是我哪里配置错了吗?