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上传时间: 2010-11-01
详细说明： FEATURES • Drop–in replacement for IBM AT computer clock/calendar • Pin configuration closely matches MC146818B and DS1285 • Counts seconds, minutes, hours, days, day of the week, date, month, and year with leap year compensation valid up to 2100 • Binary or BCD representation of time, calendar, and alarm • 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 128 RAM locations - 14 byt es of clock and control registers - 114 bytes of general purpose RAM • Programmable square wave output signal • Bus compatible interrupt signals (IRQ) • Three interrupts are separately software–maskable and testable - Time–of–day alarm once/second to once/day - Periodic rates from 122 ms to 500 ms - End of clock update cycle • Optional 28–pin PLCC surface mount package or 32–pin TQFP • Optional industrial temperature range available ...展开收缩
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