What the MSP430FR5870IRGCR brings to a BOM
It belongs to the MSP430™ FRAM family, where the program memory is 32 KB of FRAM — non-volatile, fast-write memory that eliminates the erase-before-write cycle of Flash and draws lower active current per access. On-chip RAM is 2K x 8. Connectivity covers I²C, IrDA, SCI, SPI, and UART/USART. The 51 general-purpose I/O lines give plenty of headroom for sensor arrays, keypads, and control signals.
FRAM vs Flash — what the memory type means
The 32 KB FRAM program memory is the standout feature. FRAM writes at bus speed with no erase cycle, so firmware updates over UART or SPI complete in milliseconds rather than the hundreds of milliseconds a Flash part would need for a sector erase. Endurance is effectively unlimited for data logging (10^15 cycles typical), though TI rates it for the application lifetime.