Hitachi S10mini D, Hardware Manual

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8 EXPLANATION OF OPERATION
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(2) Time control register
The time control register controls the setting of the current time of the day. Its bit
assignment is shown below.
(MSB) 2
15
2
0
(LSB)
SW200 1/0 1/0 1/0 Unused
S202: Data setting and start
(1: data setting and start, 0: normal use)
S201: Clock stop (1: stop requested, 0: stop not requested)
S200: Clock update (1: clock being updated, 0: clock update stopped)
Setting a time
Set the current time as follows:
①
Set a 1 in S201 of the time control register. The clock stops.
②
Set the time information (seconds, minutes, hours, day, month, year, and day of the
week) in time registers SW280 to SW2E0.
③
Set a 1 in S202 of the time control register. The clock starts from the set time.
④
Set 0s in both S201 and S202 of the time control register. The clock returns to
ordinary operating condition.
(3) Time display control register
The time display control register is used to set the format in which time is displayed in the
indicator. The bit assignment of the register is shown below.
(MSB) 2
15
2
0
(LSB)
SW210 1/0 1/0 1/0 Unused
S212: Month, day, and hours (1: displayed, 0: not displayed)
S211: Day, hours, and minutes (1: displayed, 0: not displayed)
S210: Hours, minutes, and seconds (1: displayed, 0: not displayed)
Display conditions
When 1s (displayed) are set in two or more bits, the setting of the bit having the smallest
number takes precedence. When 1s are set in both S210 and S212, for example, the
setting of S210 is used. When all bits are set to 0 (not displayed), the year, month, and
day are displayed.