The MSP430 microcontroller series has a few features that make it popular in intermittent/batteryless applications:

• Widely used in both batteryless and standard applications, which makes finding tools and support relatively easy
• Low power draw with configurable low power modes, important in the low power environments of most intermittent devices
• Some MSP430 boards (usually MSP430FRx) come with FRAM, non-volatile storage that is critical to maintaining state and data through the regular power losses of intermittent devices.

• Energia — 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).

• Clock Systems and Timers
• Common Communication Types

Information specific to individual MSP430 microcontrollers.

• Low Power Modes and Interrupts