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        00C - RT Status Register C

          1xxx xxxx  Interrupt Request Flag
                       This bit is used in conjunction with bits 6, 5 and
                       4. When set to 1, this bit indicates that an
                       interrupt has occured; bits 6, 5 and 4 indicate the
                       type of interrupt.
          x1xx xxxx  Periodic Interrupt Flag
                       When set to 1, this bit indicates that a periodic
                       interrupt occured.
          xx1x xxxx  Alarm Interrupt Flag
                       When set to 1, this bit indicates that an alarm
                       interrupt occured.
          xxx1 xxxx  Update-Ended Interrupt Flag
                       When set to 1, this bit indicates that an update-
                       ended interrupt occured.
          xxxx 1111  Reserved

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