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MSP430F5436A RTC occasional Reset

Other Parts Discussed in Thread: MSP430F5436

Hi 

We are working on a custom board using MSP430F5436. We make use of RTC_A module for time keeping. We use the Calendar Mode only (Counter mode not used).

We noticed that occasionally the RTC timing had been reset when our product wakes up from the Low power mode. The product has a Li-ion battery and a coin-cell battery as well. Under all conditions, there is a 3.3V power to the MSP430. So it would be safe to rule out absence of power as a cause for timing reset.

It would be helpful if we can find a way to trace the source of this reset. Are there any possible sources of reset which we can look into?

Regards,

Padmanabhan

  • Are you sure the MSP is waking up from LPM? Or is it resetting? The control registers of the RTC_A are reset on POR (including a switch to counter mode, which resets the counter registers).
    Switching from BCD to binary mode and back also clears the counter

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