UpSubject: DS1387 / ramified real time clock 4K x 8
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RAMified Real Time Clock 4K x 8 Upgraded IBM AT computer clock/calendar with 4K x 8 extended RAM Totally nonvolatile with over 10 years of operation in the absence of power Counts seconds, minutes, hours, day of the week, date, month and year with leap year compensation Binary or BCD representations of time, calendar and alarm 12– or 24–hour clock with AM and PM in 12–hour mode Multiplex bus for pin efficiency Interfaced with software as 64 user RAM locations plus 4K x 8 of static RAM – 14–bytes of clock and control registers – 50–bytes of general purpose RAM – 4K x 8 SRAM accessible by using separate control npins Programmable square wave output signal Bus–compatible interrupt signals (IRQ) Three interrupts are separately software–maskable and testable: – Time–of–day alarm once/second to once/day – End–of–clock update cycle And we salute our friends in other countries around the world! |