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28335IOData寄存器连续操作bit位会导致前一个操作失效

William chen
Prodigy 160 points
Other Parts Discussed in Thread: C2000WARE

GpioDataRegs.GPADAT.bit.GPIO0 = 0;
GpioDataRegs.GPADAT.bit.GPIO1 = 0;
这样连续操作导致IO0写入失败，中间加Nop空指令就可以，请问这是什么原理，谢谢！