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DS12C887芯片功能与解密服务

时间:2012-04-25 08:54:19

世纪芯较早就已经顺利取得技术突破,成功破解多款典型IC芯片,而由于解密难度大、周期长,使得解密成本及费用相对较高。为此,世纪芯又专门组织技术力量进行该系列芯片低成本解密方案研究,使针对DS12C887芯片解密的技术更为成熟,解密成本更低,为客户实现更大经济效益。此芯片其性能特征简单介绍:
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
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