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DS17487N-3 Datasheet(PDF) 8 Page - Dallas Semiconductor |
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DS17487N-3 Datasheet(HTML) 8 Page - Dallas Semiconductor |
8 / 38 page DS17485/DS17487 8 of 38 The three time alarm bytes can be used in two ways. First, when the alarm time is written in the appropriate hours, minutes, and seconds alarm locations, the alarm interrupt is initiated at the specified time each day if the alarm enable bit is high. The second use condition is to insert a “don’t care” state in one or more of the three time alarm bytes. The “don’t care” code is any hexadecimal value from C0 to FF. The two most significant bits of each byte set the “don’t care” condition when at logic 1. An alarm is generated each hour when the “don’t care” bits are set in the hours byte. Similarly, an alarm is generated every minute with “don’t care” codes in the hours and minute alarm bytes. The “don’t care” codes in all three time alarm bytes create an interrupt every second. The three time-alarm bytes can be used with the date alarm as described in Wake-Up/Kickstart. The century counter is discussed later in this text. Table 1. TIME, CALENDAR, AND ALARM DATA MODES RANGE ADDRESS LOCATION FUNCTION DECIMAL RANGE BINARY DATA MODE BCD DATA MODE OOH Seconds 0 to 59 00 to B 00 to 59 01H Seconds Alarm 0 to 59 00 to 3B 00 to 59 02H Minutes 0 to 59 00 to 3B 00 to 59 03H Minutes Alarm 0 to 59 00 to 3B 00 to 59 Hours 12-hour Mode 1 to 12 01 to 0C AM, 81 to 8C PM 01 to 12 AM, 81 to 92 PM 04H Hours 24-hour Mode 0 to 23 00 to 17 00 to 23 Hours Alarm 12-hour Mode 1 to 12 01 to 0C AM, 81 to 8C PM 01 to 12 AM, 81 to 92 PM 05H Hours Alarm 24-hour Mode 0 to 23 00 to 17 00 to 23 06H Days of the Week Sunday = 1 1 to 7 01 to 07 01 to 07 07H Date of Month 1 to 31 01 to 1F 01 to 31 08H Month 1 to 12 01 to 0C 01 to 12 09H Year 0 to 99 00 to 63 00 to 99 BANK 1, 48H Century 0 to 99 00 to 63 00 to 99 BANK 1, 49H Date Alarm 1 to 31 01 to 1F 01 to 31 |
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