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MSP430FR5869: Receive interrupt from LPM3

Part Number: MSP430FR5869
Other Parts Discussed in Thread: MSP-TS430RGZ48C,


I put MSP430FR5869 on MSP-TS430RGZ48C.
MSP430 has uart communication with PC.

MSP430 receives tera term data.
After that, the data is sent back to the tera term in the interrupt processing.
LPM0 can handle receive interrupts, but no interrupts will occur when waiting in LPM3.
However, from this state, if I keep pressing the keyboard, a reception interrupt may occur.

This occurs after power-up or immediately after a reset. Then, once the interrupt processing is completed, the interrupt processing is performed even after one hour.
Again, this occurs in LPM3 and no problem occurs in LPM0.

What can be considered?

Best regards,

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