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TMS320F280025C: F280049 EPWM发波问题

Part Number: TMS320F280025C

麻烦问下F280049和F280025 PWM发波的配置有什么不一样?之前在F280049芯片上已经可以实现PWM发波,现在切换到F280025芯片上,载波和比较信号都有,但是生成不了驱动信号,求大神帮忙,谢谢~