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F28335同组PIE中断是否可以实现中断嵌套?

1.外部中断1和定时器0都是PIE的第一组中断,是否可以同时挂到CPU级中断的INT_1上面?

2.定时器0和外部中断1,CPU中断优先级都是5,PIE组中断是:中断1是4,定时器0是7,这两个可不可以中断嵌套?

3,如果能中断嵌套,定时器0的中断服务函数,是不是需要执行下面3条语句,才能跳到外部中段1的服务函数去?

 EINT

IER |= M_INT1;

IER &= MINT1;

这3个问题求确认。。