28027 中timer中断为什么没有将中断标志为清0？ 程序, receive

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读实例程序如下：
interrupt void cpu_timer0_isr(void)
{
CpuTimer0.InterruptCount++;
// Acknowledge this interrupt to receive more interrupts from group 1
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}