DS1500 Y2K Watchdog RTC with Nonvolatile Control www.
maxim-ic.
com GENERAL DESCRIPTION The DS1500 is a full-function, year 2000-compliant real-time clock/calendar (RTC) with an alarm, watchdog timer, power-on reset, battery monitors, 256 bytes of on-board nonvolatile (NV) SRAM, NV control for backing up an external SRAM, and a 32.
768kHz output.
User access to all registers within the DS1500 is accomplished with a byte-wide interface, as shown in Figure 7.
The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour binary-coded decimal (BCD) format.
Corrections for day of month and leap year are made automatically.
FEATURES § BCD-Coded Century, Year...

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