DS1287 Description
AD0 AD7 NC MOT CS AS R/W DS RESET IRQ drain) SQW VCC GND Multiplexed address/data bus No connection Bus type selection Chip select Address strobe Read/write input Data strobe Reset input Interrupt request output (open Square wave output +5 volt supply Ground Programmable square wave output signal Bus-patible interrupt signals (IRQ) Three interrupts are separately software-maskable and testable Time-of-day alarm...
DS1287 Key Features
- Drop-in replacement for IBM AT puter clock/calendar
- Pin patible with the MC146818A
- Self-contained
- Counts
- Binary or BCD representation of time, calendar, and
- 12- or 24-hour clock with AM and PM in 12-hour mode
- Daylight Savings Time option
- Selectable between Motorola and Intel bus timing
- Multiplex bus for pin efficiency
- Interfaced with software as 64 RAM locations