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帮忙解答下430f5438a延时死机问题

最近遇到很怪异的问题,芯片是430F5438a,开发平台是IAR,程序运行到IAR自带延时函数__delay_cycles(2000000)的时候就死在这里,但是当中断触发来的时候,又能响应中断并执行中断里的程序,执行完后出中断后还是死在__delay_cycles(2000000)这里,这个问题不是一直发生,只是偶尔出现