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TMS320F28027: PIECTRL的ENPIE位以及EALLOW问题

Part Number: TMS320F28027


第一个问题如下

PieCtrlRegs.PIECTRL.bit.ENPIE = 1和PieCtrlRegs.PIECTRL.bit.ENPIE = 0两者对程序的影响?我现在的程序是下载到FLASH中去的 请问采用哪种方式比较好?

第二个问题如下

手册没有规定受EALLOW保护的寄存器采取了EALLOW保护会有什么影响?

EALLOW

EPwm4Regs.TBPRD = 1500;  

EDIS

原本TBPRD不受EALLOW保护的

谢谢!