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RV5C338A Datasheet(PDF) 20 Page - RICOH electronics devices division |
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RV5C338A Datasheet(HTML) 20 Page - RICOH electronics devices division |
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20 / 52 page  17 R ×5C338A 2.4 Day-of-week Counter (at Address 3h) D7 D6 D5 D4 D3 D2 D1 D0 — — — — — W4 W2 W1 0 0 0 0 0 W4 W2 W1 0 0 0 0 0 Indefinite Indefinite Indefinite (For writing) (For reading) 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 day-of-week counter is incremented by 1 when the day-of-week digits are carried to the day-of-month digits. · Day-of-week display (incremented in septimal notation): (W4, W2, W1) = (0, 0, 0) → (0, 0, 1) →...→ (1, 1, 0) → (0, 0, 0) · Correspondences between days of the week and the day-of-week digits are user-definable (e.g. Sunday = 0, 0, 0) · The writing of (1, 1, 1) to (W4, W2, W1) is prohibited except when days of the week are unused. 2.5 Calendar Counters (at Address 4h to 6h) · The calendar counters are configured to display the calendar digits in BCD format by using the automatic calen- dar function as follows: The day-of-month digits (D20 to D1) range from 1 to 31 for January, March, May, July, August, October, and December; from 1 to 30 for April, June, September, and November; from 1 to 29 for February in leap years; from 1 to 28 for February in ordinary years. The day-of-month digits are carried to the month digits in reversion from the last day of the month to 1. The month digits (MO10 to MO1) range from 1 to 12 and are carried to the year digits in reversion from 12 to 1. The year digits (Y80 to Y1) range from 00 to 99 (00, 04, 08, ... , 92, and 96 in leap years) and are carried to the 19/20 digits in reversion from 99 to 00. The 19/20 digits cycle between 0 and 1 in reversion from 99 to 00 in the year digits. · Any carry from lower digits with the writing of non-existent calendar data may cause the calendar counters to mal- function. Therefore, such incorrect writing should be replaced with the writing of existent calendar data. 2.5-1 Day-of-month Counter (at Address 4h) D7 D6 D5 D4 D3 D2 D1 D0 — — D20 D10 D8 D4 D2 D1 0 0 D20 D10 D8 D4 D2 D1 0 0 Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite (For writing) (For reading) Default settings* 2.5-2 Month Counter + Century Bit (at Address 5h) D7 D6 D5 D4 D3 D2 D1 D0 19/20 — — MO10 MO8 MO4 MO2 MO1 19/20 0 0 MO10 MO8 MO4 MO2 MO1 Indefinite 0 0 Indefinite Indefinite Indefinite Indefinite Indefinite (For writing) (For reading) Default settings* |
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