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MSP430FR5989: LOCKLPM5

Part Number: MSP430FR5989

Currently, my company has some problems with the low power of the MSP430FR5989, I hope you can help me.
- When clearing LOCKLPM5 bit in the PM5CTL0 register, the Current-Consumption increases from ~4uA to ~160uA even though no I/O pin has been configured. All I/O pins don't connect to anything.
- Is there a way to get low power and can configure the I/O pin (related LOCKLPM5 bit)?

Thanks,

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