2.5.1 RTC Counter Value not Correctly Read After Sleep

If a real-time counter (RTC) interrupt is used to wake up the device from sleep, and bit 0 of the RTC count register (CNT) has the same value as when the device entered a sleep mode, CNT will not be read correctly during the first prescaled RTC clock cycle after wakeup. The read value will be the same as the value in the register when entering sleep.

Work Around

Wait at least one prescaled RTC clock cycle before reading CNT.

Affected Silicon Revisions