it does not mean user would have to set up this wait time manually
So I want to modify the erase process
： close external interrupts => EHV=1 => waiting for DONE => EHV=0 => open external interrupts；
to ：close external interrupts => EHV=1 => open external interrupts=> polls MCR[DONE] => EHV=0；
We need to assess the risk of change ?
in this period time need to pay attention to what ?
Is there a special document to introduce this ?