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DS14285N Datasheet(PDF) 9 Page - Dallas Semiconductor |
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DS14285N Datasheet(HTML) 9 Page - Dallas Semiconductor |
9 / 26 page DS14285/DS14287 9 of 26 24-12 bit cannot be changed without reinitializing the hour locations. When the 12-hour format is selected, the high order bit of the hours byte represents PM when it is a logic one. The time, calendar, and alarm bytes are always accessible because they are double buffered. Once per second the 10 bytes are advanced by 1 second and checked for an alarm condition. If a read of the time and calendar data occurs during an update, a problem exists where seconds, minutes, hours, etc. may not correlate. The probability of reading incorrect time and calendar data is low. Several methods of avoiding any possible incorrect time and calendar reads are covered later in this text. The three 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 3 alarm bytes. The “don’t care” code is any hexadecimal value from C0 to FF. The 2 most significant bits of each byte set the “don’t care” condition when at logic 1. An alarm will be 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 alarm bytes create an interrupt every second. Table 1. Time, Calendar, and Alarm Data Modes RANGE ADDRESS LOCATION FUNCTION DECIMAL RANGE BINARY DATA MODE BCD DATA MODE 0 Seconds 0-59 00-3B 00-59 1 Seconds Alarm 0-59 00-3B 00-59 2 Minutes 0-59 00-3B 00-59 3 Minutes Alarm 0-59 00-3B 00-59 Hours-12-hr Mode 1-12 01-0C AM, 81-8C PM 01-12AM, 81-92PM 4 Hours-24-hr Mode 0-23 00-17 00-23 Hours Alarm-12-hr 1-12 01-0C AM, 81-8C PM 01-12AM, 81-92PM 5 Hours Alarm-24-hr 0-23 00-17 00-23 6 Day of the Week Sunday = 1 1-7 01-07 01-07 7 Date of the Month 1-31 01-1F 01-31 8 Month 1-12 01-0C 01-12 9 Year 0-99 00-63 00-99 |
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