SLAZ668P May   2015  – August 2021 MSP430FG6625

 

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6.28 RTC16

RTC Module

Category

Functional

Function

RTC_B module can seem stuck or function abnormally (jumping RTC)

Description

If VBAT and DVCC (VPRIM) power up slowly and cross around the VBAK switching threshold, internal functions may not reset properly.
This can lead to a stuck RTC_B module or to unexpected functionality e.g. RTC_B is running faster which causes the observed time value to jump or skip forward.

Workaround

Prevent DVCC (VPRIM) and VBAT from crossing each other below 2V during power up. It does not matter which signal comes up first.