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    Dallas幻影实时时钟系列器件的应用

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    上传日期: 2009-05-19

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    标签:Dallas(6)
    The Dallas Phantom Real Time Clocks are a family of
    devices that offer the combination of a transparent
    CMOS timekeeper and a nonvolatile static RAM meeting
    the standard JEDEC bytewide pinouts. Some varieties
    of the Dallas Phantom Real Time Clocks also provide
    a transparent CMOS timekeeper for use with ROM.
    The timekeeper is transparent to the RAM/ROM
    memory map because it does not occupy any of the
    existing RAM/ROM locations. These devices are
    termed “Phantom” because the timekeeper is accessed
    only when a predetermined 64–bit pattern has been
    received by the device. When the timekeeper is not
    being accessed, the RAM/ROM can be accessed normally.
    The timekeeper keeps track of hundredths of
    seconds, seconds, minutes, hours, day, date, month,
    and year information. In the absence of power, a lithium
    energy source maintains the timekeeping operation and
    retains data in the CMOS static RAM.

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