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        00B - Status Register B

        Real Time Clock Status Register.

                1xxx xxxx  Set
                             When set to 0, this bit updates the cycle,
                             normally by advancing the counts at a rate of
                             one per second. When set to 1, this bit
                             immediately ends any update cycle in progress,
                             and the program can initialize the 14 time bytes
                             without any futher updates occurring until this
                             bit is set to 0.
                x1xx xxxx  Periodic Interrupt Enable
                             This bit is a read/write bit that allows an
                             interrupt to occur at a rate specified by the
                             rate and divider bits in Status Register A
                             (00A). When set to 1, this bit enables inter-
                             rupt. The system initializes this bit to 0.
                xx1x xxxx  Alarm Interrupt Enable
                             When set to 1, this bit enables the alarm inter-
                             rupt. The system initializes this bit to 0.
                xxx1 xxxx  Update-Ended Interrupt Enabled
                             When set to 1, this bit enables the update-
                             ended interrupt. The system initializes
                             this bit to 0.
                xxxx 1xxx  Square Wave Enabled
                             When set to 1, this bit enables the square-
                             frequency as set by the rate-selection bits
                             in Status Register A (00A). The system initia-
                             lizes this bit to 0.
                xxxx x1xx  Date Mode
                             This bit indicates if the time-and-date calendar
                             updates use binary or binary-coded-decimal (BCD)
                             formats. When set to 1, this bit indicates a
                             binary format. The system initializes this bit
                             to 0.
                xxxx xx1x  24-Hour Mode
                             This bit establishes if the hours byte is in
                             the 24-hour or 12-hour mode. When set to 1, this
                             bit indicates the 24-hour mode. The system
                             initializes this bit to 1.
                xxxx xxx1  Daylight Savings Enabled
                             When set to 1, this bit enables the daylight
                             savings time mode. When set to 0, it disables
                             the mode, and the clock reverts to standart
                             time. The system initializes this bit to 0.