RTC

Hi, I am using inbuilt RTC in LPC2368. My query is if vdd is on(from SMPS) condition,then RTC draws power from 3.3v cell button battery or Vdd(controller core)?

what is mean by,

IBATact --> active mode battery supply current - DC-DC on = 20uA - DC-DC off = 28uA
(page no 35 from datasheet)

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