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RV5C387A Datasheet(PDF) 20 Page - RICOH electronics devices division

Part No. RV5C387A
Description  I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C387A Datasheet(HTML) 20 Page - RICOH electronics devices division

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RV5C387A
20
2.7 Alarm_W Registers (at Addresses 8h to Ah)
D7
D6
D5
D4
D3
D2
D1
D0
—WM40
WM20
WM10
WM8
WM4
WM2
WM1
0WM40
WM20
WM10
WM8
WM4
WM2
WM1
0
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
(For writing)
(For reading)
Default settings*
2.7-1 Alarm_W Minute Register (at Address 8h)
D7
D6
D5
D4
D3
D2
D1
D0
——
WH20,WP/A
WH10
WH8
WH4
WH2
WH1
00
WH20,WP/A
WH10
WH8
WH4
WH2
WH1
00
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
(For writing)
(For reading)
Default settings*
2.7-2 Alarm_W Hour Register (at Address 9h)
D7
D6
D5
D4
D3
D2
D1
D0
—WW6
WW5
WW4
WW3
WW2
WW1
WW0
0WW6
WW5
WW4
WW3
WW2
WW1
WW0
0
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
(For writing)
(For reading)
Default settings*
2.7-3 Alarm_W Day-of-week Register (at Address Ah)
· The D5 bit of the Alarm_W hour register represents WP/A when the 12-hour mode is selected (0 for a.m. and 1
for p.m.). and WH20 when the 24-hour mode is selected (tens in the hour digits).
· The Alarm_W registers should not have any non-existent alarm time settings. (Note that any mismatch between
current time and preset alarm time specified by the Alarm_W registers may disable the alarm circuit.)
· When the 12-hour mode is selected, the hour digits read 12 and 32 for 0 a.m. and 0 p.m., respectively (see “2.1-2
12/24: 12-/24-hour Mode Selection Bit”).
·WW0 to WW6 correspond to W4, W2, and W1 of the day-of-week counter with settings ranging from (0, 0, 0) to (1,
1, 0).
·WW0 to WW6 with respective settings of 0 disable the outputs of the Alarm_W registers.
*) Default settings: Default value means read/written values when the XSTP bit is set to “1” due to power-on from 0 volts or supply voltage drop.
An increase of two clock pulses once per 20 seconds causes a time count loss of approximately 3ppm (2 / (32768
×
20=3.051ppm). Conversely, a decrease of two clock pulses once per 20 seconds causes a time count gain of 3ppm.
Consequently, deviations in time counts can be corrected with a precision of ±1.5ppm. Note that the oscillation
adjustment circuit is configured to correct deviations in time counts and not the oscillation frequency of the 32.768-
kHz clock pulses. For further details, see “USAGE, 2.4 Oscillation Adjustment Circuit”.


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