Rainbow Electronics DS1486P - Manual (Page 8)

DS1486/DS1486P
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When the interrupt is in the pulse mode (see bit 4 definition), this flag will be in the logic 1 state only
during the time the interrupt is active.
TDF - Bit 0 Time of Day Flag - This is a read-only bit. This bit is set to a logic 1 when a Time of Day
alarm has occurred. The time the alarm occurred can be determined by reading the Time of Day Alarm
registers. This bit is reset to a logic 0 state when any of the Time of Day Alarm registers are accessed.
When the interrupt is in the pulse mode (see bit 4 definition), this flag will be in the logic 1 state only
during the time the interrupt is active.