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RV5C387A Datasheet(PDF) 20 Page - RICOH electronics devices division |
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RV5C387A Datasheet(HTML) 20 Page - RICOH electronics devices division |
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20 / 49 page  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”. |
Similar Part No. - RV5C387A_03 |
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Similar Description - RV5C387A_03 |
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