| Real-time clock/calendar: tracks hundredths of seconds, seconds, minutes, hours, days, date, months, years, and leap years Accuracy >±2 minutes/month at 25°C Watchdog timer monitors/restarts processor Programmable time-of-day and real-time watchdog alarms Interrupt outputs active during battery backup mode Controller circuitry supports up to 128k x 8 external SRAM All registers individually addressed through bytewide interface 50 bytes of user NV RAM Low-power CMOS circuitry: <1µA battery current in standby mode Square wave outputs Operating range: 0°C to +70°C Voltage/power-fail tolerance: 5V ±10% |