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PICList Thread
'Y2K - Real world example'
1998\10\10@222659 by Russell McMahon

picon face
The following is copied directly from a message on the Philips
microcontroller list.

As may be seen, the OKI RTC chips have a 2 digit century counter
(classic Y2K 2 digit rollover).
While this problem would be easily handled now that the subject is
"all the rage" you can bet there are some applications using these
ICs which will not do so.



       regards

                           Russell McMahon

Copy starts here:


 From    :  Ojahan Hutajulu <spam_OUTsatunolTakeThisOuTspamearthling.net>
I just received this release from OKI Taiwan regarding my last post
(OKI
rtc y2k compatibility).

Ojahan
-------------

Oki Electric Industry Co., Ltd
Tel:+81-3-5445-6050   Fax:+81-3-5445-6063
4-10-3, Shibaura Minato-ku, Tokyo 108-8551 Japan
23, July 1998


Dear Customers,

     In order to support your evaluation of products and systems
regarding
the " Year 2000  Capability", we would like to provide you with the
following information about OKI products:

     Potentially every OKI product that uses date data could be
affected
by the transition to the year 2000.  For detailed explanations, we
categorizes the OKI products into group A and B:,

A:  OKI Realtime Clock IC's

     The behavior of OKI Realtime Clock IC's concerning the "Year
2000
capability" can  be summarized as follows,  while the explanation
refers
expressly, but not limited to the following devices:
                 MSM5832
                 MSM58321
                 MSM62(X)42B
                 MSM6542
                 MSM6782
                 ML9070

      1.  The representation of the year in dates

         The year in dates is represented by the last two digits,
e.g.
"00" for 2000.
         There is no explicit or implicit distinction of the century
in
the device itself. This means that the date "31/12/99" is followed by
"01/01/00"

      2. The recognition of 2000 as a leap year

        The year 2000 is regarded as leap year (for MSM58321: if
register
D10 is
        set to Gregorian calendar ). This means that the date
"28/02/00"
is followed
        "29/02/00".

      3. The determination of the day of the week

         The day of the week (Mon., Tues., Wed., ....) is obtained
by
incrementing a counter   and not by calculation from the date. This
means
that it does not have a relation to  the date and the actual century.

       As mentioned in the technical explanations in A1.-A3.,  OKI
Realtime Clock IC's can lead to a misinterpretation of the date
during the
transition to the year 2000 with the result of a partly or totally
failure
of function.

       Due to this reason each customer, who is using OKI Realtime
Clock
IC's, has the responsibility to assure the "Year 2000 Capability"
within
his applications.

B:      Other OKI Products

      Regarding all other OKI products, we would like to point out
that
problems could arise, if the customer-specific application-software
contains relevant information about the transition to the year 2000.
      Due to this reason only the individual customer can take the
responsibility to make sure that all applications are prepared for
the
transition to the year 2000.

       Please note that all information from OKI about the "Year
2000
Capability "of its products should have the pure purpose to support
our
customers in their preparations for the year 2000.
       Any statement from OKI about the "Year 2000 Capability " of
any
products or any other aspect of the year 2000 transition does not
modify or
extend any existing warranty, license, term of use, or contract.

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