资 源 简 介
The FM33256 and FM3316 are devices that integrateFRAM memory with the most commonly neededfuncTIons for processor-based systems. Majorfeatures include nonvolaTIle memory, real-TIme clock,low-VDD reset, watchdog TImer, nonvolatile eventcounter, lockable 64-bit serial number area, andgeneral purpose comparator that can be used for apower-fail (NMI) interrupt or other purpose. Thedevices operate from 2.7 to 3.6V.Each FM33xx provides nonvolatile RAM available inmemory capacity of 16Kb and 256Kb. Fast writespeed and unlimited endurance allow the memory toserve as extra RAM or conventional nonvolatilestorage. This memory is truly nonvolatile rather thanbattery backed.The real-time clock (RTC) provides time and dateinformation in BCD format. It can be permanentlypowered from external backup voltage source, eithera battery or a capacitor. The timekeeper uses acommon external 32.768 kHz crystal and provides acalibration mode that allows software adjustment oftimekeeping accuracy.
