- Direct clock/calendar replacement for IBM? AT-compatible computers and other applications
- Functionally compatible with the DS1287/DS1287A and MC146818A
- 114 bytes of general nonvolatile storage
- Automatic backup supply and write-protection to make external SRAM nonvolatile
- Integral lithium cell and crystal
- 160 ns cycle time allows fast bus operation
- Intel bus timing
- 14 bytes for clock/calendar and control
- BCD or binary format for clock and calendar data
- Calendar in day of the week, day of the month, months, and years with automatic leap-year adjustment
- Time of day in seconds, minutes, and hours - 12- or 24-hour format - Optional daylight saving adjustment
- Programmable square wave output
- Three individually maskable interrupt event flags: - Periodic rates from 122us to 500ms - Time-of-day alarm once per second to once per day - End-of-clock update cycle
- Better than one minute per month clock accuracy
|