DS1500
DESCRIPTION
The DS1500 is a full-function, year 2000-pliant 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 32.768k Hz output. User access to all registers within the DS1500 is acplished 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, Month, Date, Day, Hours, Minutes, and Seconds with Automatic Leap-Year pensation Valid Up to the Year 2100 Programmable Watchdog Timer and RTC Alarm Century Register; Y2K-pliant RTC Automatic Battery Backup and Write Protection to External SRAM +5V Operation Precision Power-On Reset Power-Control Circuitry Supports System Power On from Date/Day/Time Alarm or Key Closure 256...
