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DS1677 Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS1677 Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 17 page DS1677 5 of 17 DS1677 ADDRESS MAP Figure 3 BIT7 BIT0 00 0 10 SECONDS SECONDS 01 0 10 MINUTES MINUTES 02 0 12 24 10 HR A/P 10 HR HOURS 03 0 0 0 0 0 DAY 04 0 0 10 DATE DATE 05 0 0 0 10 MO. MONTH 06 10 YEAR YEAR 07 M 10 SEC ALARM SECONDS ALARM 08 M 10 MIN ALARM MINUTES ALARM 09 M 12 24 10 HR A/P 10 HR HOUR ALARM 0A M 0 0 0 DAY ALARM 0B CONTROL REGISTER 0C STATUS REGISTER 0D WATCHDOG REGISTER 0E ADC REGISTER 0F 7F RESERVED CLOCK, CALENDAR AND ALARM The time and calendar information is accessed by reading/writing the appropriate register bytes. Note that some bits are set to zero. These bits will always read zero regardless of how they are written. Also note that registers 0Fh to 7Fh are reserved. These registers will always read zero regardless of how they are written. The contents of the time, calendar, and alarm registers are in the Binary–Coded Decimal (BCD) format. The DS1677 can run in either 12–hour or 24–hour mode. Bit 6 of the hours register is defined as the 12– or 24–hour mode select bit. When high, the 12–hour mode is selected. In the 12–hour mode, bit 5 is the AM/PM bit with logic one being PM. In the 24–hour mode, bit 5 is the second 10–hour bit (20–23 hours). The DS1677 also contains a time of day alarm. The alarm registers are located in registers 07h to 0Ah. Bit 7 of each of the alarm registers are mask bits (see Table 1). When all of the mask bits are logic 0, an alarm will occur once per week when the values stored in timekeeping registers 00h to 03h match the values stored in the time of day alarm registers. An alarm will be generated every day when mask bit of the day alarm register is set to one. An alarm will be generated every hour when the day and hour alarm mask bits are set to one. Similarly, an alarm will be generated every minute when the day, hour, and minute alarm mask bits are set to one. When day, hour, minute, and seconds alarm mask bits are set to one, an alarm will occur every second. |
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