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TMS320F280037: PLL状态位疑惑的点

Part Number: TMS320F280037

 请问我选择的这个两个标志位中,REF_LOSTS应该怎么理解?是LOCKS置0后恢复会触发一次REF_LOSTS置1吗。PLL锁在频率发生漂移时会会触发LOCKS置0吗,还是说会触发LOCKS置0