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DS1284Q+T Datasheet(PDF) 8 Page - Dallas Semiconductor |
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DS1284Q+T Datasheet(HTML) 8 Page - Dallas Semiconductor |
8 / 18 page DS1284/DS1286 8 of 18 interrupt output goes to the active state, which is determined by bits 0, 4, 5, and 6 of the command register. Bit 1: Watchdog Alarm Flag (WAF). When this bit is set internally to logic 1, a watchdog alarm has occurred. This bit is read-only and writing this register has no effect on the bit. The bit is reset when any of the watchdog alarm registers are accessed. The WAM bit has no effect on the operation of this bit. If pulse mode (PU/LVL = 1) is selected, the watchdog continues to run and the flag is internally written to 0 at the end of the pulse. The WAM bit has no effect on the operation of this bit. Bit 0: Time-of-Day Alarm Flag (TDF). When this bit is set internally to a logic 1, indicates that a match with the time-of-day alarm registers has occurred. This bit is read-only and writing this register has no effect on the bit. The time of the alarm can be determined by reading the time-of-day alarm registers. The bit is reset when any of the time-of-day alarm registers are read. The TDM bit has no effect on the operation of this bit. Figure 3. Time-of-Day Alarm Mask Bits REGISTER (03h) MINUTES (05h) HOURS (07h) DAYS FUNCTION 1 1 1 Alarm once per minute 0 1 1 Alarm when minutes match 0 0 1 Alarm when hours and minutes match 0 0 0 Alarm when hours, minutes, and days match |
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