interrupt void PIE_illegalIsr(void) 非法中断的机制是什么？

您可以参考下

processors.wiki.ti.com/.../Interrupt_FAQ_for_C2000

另外您可以试一下通过下面的代码找出哪个中断被非法触发

//PIEVECT of PIECTRL register stores the vector address from the PIE vector table from which the vector was fetched.
// (the vector address - base address of PIE vector table)/2 gives the interrupt vector ID
address_offset = ((PieCtrlRegs.PIECTRL.all) & (0x00000000FE));
interrupt_num = (address_offset >> 1);