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QEP中断只能进去一次

xiaokun yi
Expert 2530 points


用的是2802的QEP1，使能的中断是position-compare match，并在中断服务子程序中置QCLR.BIT8，置PIEACK.BIT4，清INTM。从中断出来之后就不能再进去，尽管QFLG.BIT8=1，IER.BIT4=1。请教下问题在哪？