Not according to the TRM. On the other hand, that Table suggests that you won't achieve 270uA with PWRMD=0. I don't know the answer. At this point I'd be experimenting. Is there any chance there's something electrical (outside the chip)? If you set RES=2 and PWRMD=2, does that change anything? Does SHP=1 change the consumption? Setting ISSH=1 is a quick experiment to see if the width of the timer pulse has any influence at all.
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