The FM31256-GTR is a 256-Kbit processor companion integrating nonvolatile F-RAM, a real-time clock/calendar, and supervisory functions in a 14-pin SOIC. It features 32K × 8 memory, 100 trillion read/write cycles, and 151-year data retention. Key functions include a programmable watchdog timer, low-VDD reset, dual event counters, and a 64-bit lockable serial number.