详细说明：

芯谷研究所专业承接DS12C887芯片解密服务，我们专业的解密技术团队整合既有的解密技术资源，将为广大客户提供安全可靠、具备极强的经济价值的IC解密方案。
这里我们提供对单片机DS12C887的基本性能特征介绍，供客户及工程师参考借鉴。
FEATURES
· Drop-in replacement for IBM AT computer clock/calendar
· Pin compatible with the MC146818B and DS1287
· Totally nonvolatile with over 10 years of operation in the absence of power
· Self-contained subsystem includes lithium,quartz, and support circuitry.
· 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
– 15 bytes of clock and control registers
– 113 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
· Century register