توضیحات
FEATURES
ß Drop–in replacement for IBM AT computer
clock/calendar
ß Pin compatible with the MC146818B and
DS1287A
ß Totally nonvolatile with over 10 years of
operation in the absence of power
ß Self–contained subsystem includes lithium,
quartz, and support circuitry
ß Counts seconds, minutes, hours, days, day of
the week, date, month, and year with leap
year compensation valid up to 2100
ß Binary or BCD representation of time,
calendar, and alarm
ß 12– or 24–hour clock with AM and PM in
12–hour mode
ß Daylight Savings Time option
ß Selectable between Motorola and Intel bus
timing
ß Multiplex bus for pin efficiency
ß Interfaced with software as 128 RAM
locations
– 14 bytes of clock and control registers
– 114 bytes of general purpose RAM
ß Programmable square wave output signal
ß Bus–compatible interrupt signals (IRQ )
ß Three interrupts are separately software–
maskable and testable
– Time–of–day alarm once/second to
once/day
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