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R2023K Datasheet(PDF) 17 Page - RICOH electronics devices division |
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R2023K Datasheet(HTML) 17 Page - RICOH electronics devices division |
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17 / 50 page  R2023K/T 17 * 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. • Calendar Counter (Address 4-6h) Day-of-month Counter (Address 4h) D7 D6 D5 D4 D3 D2 D1 D0 - - D20 D10 D8 D4 D2 D1 (For Writing) 0 0 D20 D10 D8 D4 D2 D1 (For Reading) 0 0 Indefi nite Indefi nite Indefi nite Indefi nite Indefi nite Indefi nite Default Settings *) Month Counter + Century Bit (Address 5h) D7 D6 D5 D4 D3 D2 D1 D0 19 /20 - - MO10 MO8 MO4 MO2 MO1 (For Writing) 19 /20 0 0 MO10 MO8 MO4 MO2 MO1 (For Reading) Indefi nite 0 0 Indefi nite Indefi nite Indefi nite Indefi nite Indefi nite Default Settings *) Year Counter (Address 6h) D7 D6 D5 D4 D3 D2 D1 D0 Y80 Y40 Y20 Y10 Y8 Y4 Y2 Y1 (For Writing) Y80 Y40 Y20 Y10 Y8 Y4 Y2 Y1 (For Reading) Indefi nite Indefi nite Indefi nite Indefi nite Indefi nite Indefi nite Indefi nite Indefi nite Default Settings *) *) Default settings: Default value means read / written values when the PON bit is set to “1” due to VDD power-on from 0 volts. * The calendar counters are configured to display the calendar digits in BCD format by using the automatic calendar 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 malfunction. Therefore, such incorrect writing should be replaced with the writing of existent calendar data. |
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