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The MSP430 microcontroller series has a few features that make it popular in intermittent/batteryless applications:
Energia is a Arduino clone for the MSP430. Unfortunately, it hasn't been updated since 2019. So, expect some issues.
The following information is applicable to either all MSP430 boards, or a general subcategory of those boards (e.g. MSP430FRx).
Information specific to individual MSP430 microcontrollers.