64 KB FRAM — the unified memory that changes the power budget
Its headline feature is 64 KB of FRAM program memory — a non-volatile storage that writes at bus speed, draws negligible power, and eliminates the erase-before-write penalty of Flash. The 2K x 8 SRAM handles the runtime stack and buffer, while the integrated 12-bit ADC with 12 channels samples analog inputs directly.
Supply rail and temperature — where this MCU lives on the board
The supply range runs from 1.8 V up to 3.6 V, so you can run it straight off a single Li-ion cell or a regulated 3.3 V rail without an extra LDO.
Peripherals and connectivity — what the 31 I/O pins give you
With 31 I/O lines, this MCU has room for a keypad, a small character LCD, and a handful of sensors. Brown-out reset, power-on reset, and a watchdog timer are all on-chip, so external supervisor ICs are optional.