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Page - 8 MQ372-02
4) STOP bit
This bit is used to stop functions related to the RTC's internal counter operations.
Writing a "1" to this bit stops the counter operations.
Writing a "0" to this bit cancels stop status (restarts operations).
∗ For optimum performance, do not use this bit for functions other than the clock and calendar functions.
STOP
Data Description
0
[Normal operation mode]
This bit is used to cancel stop status for (i.e., restart) the clock and calendar
function. Also, when "1" is written to the STOP bit, it cancels stop status for
the fixed-cycle timer function.
∗
When the RESET bit value is "1" operation will not be restarted. To restart operation, a "0" must
be written to both the STOP bit and the RESET bit.
Write/Read
1
[Operation stop mode]
Stops updating of year, month, date, day, hour, minute, and second values
and partially stops the fixed-cycle timer function.
(Stop 1) Stops updating of year, month, date, day, hour, minute, and
second values
• This stops all clock and calendar update operations.
Once this occurs, no more time update interrupt events or alarm
interrupt events occur.
(Stop 2) Partially stops the fixed-cycle timer function
• If the fixed-cycle timer's source clock settings include an update
setting of 64 Hz, 1 Hz, or "Minute", the fixed-cycle timer function does
not operate.
∗
However, this function does operate
when the fixed-cycle timer's source
clock setting is 4096 Hz.
When this bit value is "1", internal divider stops from 2048Hz to 1 Hz .
5) RESET bit
Like the STOP function described above, this function stops functions related to counter operations. It also
resets the RTC module's internal counter value when the value is less than one second.
Writing a "1" to this bit stops the counter operation and resets the RTC module's internal counter value when the
value is less than one second.
Writing a "0" to this bit cancels stop status for (restarts) these operations. If a STOP condition or repeated
START condition is received while the 0.95-second bus timeout function is operating, stop status is automatically
canceled (the RESET bit value is changed from "1" to "0").
∗ For optimum performance, do not use this bit for functions other than the clock and calendar functions.
RESET
Data Description
0
[Normal operation mode]
This bit is used to cancel stop status for (i.e., restart) the clock and calendar
function. Also, when "1" is written to the RESET bit, it cancels stop status for
the fixed-cycle timer function.
∗
Since operation is not restarted when the STOP bit value is "1", to restart operation, a "0" must be
written to both the STOP bit and the RESET bit.
Write/Read
1
[Operation stop mode]
Stops updating of year, month, date, day, hour, minute, and second values
and partially stops the fixed-cycle timer function.
(Stop 1) Stops updating of year, month, date, day, hour, minute, and
second values
• This stops all clock and calendar update operations.
Once this occurs, no more time update interrupt events or alarm
interrupt events occur.
(Stop 2) Partially stops the fixed-cycle timer function
• If the fixed-cycle timer's source clock settings include an update
setting of 64 Hz, 1 Hz, or "Minute", the fixed-cycle timer function does
not operate.
∗
However, this function does operate when the fixed-cycle timer's source clock setting is
4096 Hz.
(Note) When this bit value is "1", the internal divider keeps the reset state, from 2048Hz to 1 Hz .