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28335的ePWM的映射寄存器

TBCTL寄存器的PRDLD位为0时,TBPRD寄存器在时间基准计数器TBCTR等于0时从映射寄存器中加载,当该位为1时,立即加载到TBPRD,而无须使用映射寄存器。请问什么时候该用映射寄存器、什么时候该直接加载?