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RV5C387A Datasheet(PDF) 16 Page - RICOH electronics devices division

Part No. RV5C387A
Description  I2C-bus Real-Time Clock ICs 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) 16 Page - RICOH electronics devices division

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RV5C387A
PRELIMINARY
12345
- 16 -
F6 to F0 bits
The Oscillation Adjustment Circuit is configured to change time counts of 1 second on the basis of the settings
of
the Oscillation Adjustment Register when the second digits read 00, 20, or 40 seconds.
Normally, the Second
Counter is incremented once per 32768 32.768-kHz clock pulses generated by the crystal oscillator.
Writing to
the F6 to F0 bits activates the oscillation adjustment circuit.
*
The Oscillation Adjustment Circuit will not operate with the same
timing (00, 20, or 40 seconds)
as the timing of writing to the Oscillation Adjustment Register.
*
The F6 bit setting of 0 causes an increment of time counts by ((F5, F4, F3, F2, F1, F0) - 1) x 2.
The F6 bit setting of 1 causes a decrement of time counts by ((/F5, /F4, /F3, /F2, /F1, /F0) + 1) x 2.
The settings of "*, 0, 0, 0, 0, 0, *" ("*" representing either "0" or "1") in the F6, F5, F4, F3, F2, F1, and F0
bits cause neither an increment nor decrement of time counts.
Example:
When the second digits read 00, 20, or 40, the settings of "0, 0, 0, 0, 1, 1, 1" in the F6, F5, F4, F3, F2, F1, and F0
bits cause an increment of the current time counts of 32768 by (7 - 1) x 2 to 32780 (a current time count loss).
When the second digits read 00, 20, or 40, the settings of "0, 0, 0, 0, 0, 0, 1" in the F6, F5, F4, F3, F2, F1, and F0
bits cause neither an increment nor a decrement of the current time counts of 32768.
When the second digits read 00, 20, or 40, the settings of "1, 1, 1, 1, 1, 1, 0" in the F6, F5, F4, F3, F2, F1, and F0
bits cause a decrement of the current time counts of 32768 by (- 2) x 2 to 32764 (a current time count gain).
An increase of two clock pulses once per 20 seconds causes a time count loss of approximately 3 ppm (2 / (32768
x 20 = 3.051 ppm).
Conversely, a decrease of two clock pulses once per 20 seconds causes a time count gain of
3 ppm.
Consequently, deviations in time counts can be corrected with a precision of
±1.5 ppm. 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 "14. 2. 4.
Oscillation Adjustment Circuit".
13.2.7.
Alarm_W Registers (Address 8-Ah)
Alarm_W Minute Register (Address 8h)
D7
D6
D5
D4
D3
D2
D1
D0
-
WM40
WM20
WM10
WM8
WM4
WM2
WM1
(For Writing)
0
WM40
WM20
WM10
WM8
WM4
WM2
WM1
(For Reading)
0
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Default Settings *)
Alarm_W Hour Register (Address 9h)
D7
D6
D5
D4
D3
D2
D1
D0
-
-
WH20
WP
⋅/A
WH10
WH8
WH4
WH2
WH1
(For Writing)
0
0
WH20
WP
⋅/A
WH10
WH8
WH4
WH2
WH1
(For Reading)
0
0
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Default Settings *)
Alarm_W Day-of-week Register (Address Ah)
D7
D6
D5
D4
D3
D2
D1
D0
-
WW6
WW5
WW4
WW3
WW2
WW1
WW0
(For Writing)
0
WW6
WW5
WW4
WW3
WW2
WW1
WW0
(For Reading)
0
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Default Settings *)
*)
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.
*
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.


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