PCF8563

14/23

Alarm re gisters

When one or more of the alarm registers are loaded with a valid minute, hour, day or

weekday and its corresponding AE (Alarm Enable) bit is a logic 0, then that information

will be compared with the current minute, hour, day and weekday. When all enabled

comparisons first match, the bit AF (Alarm Flag) is set.

AF will remain set until cleared by software. Once AF has been cleared it will only be set

again when the time increments to match the alarm condition once more. Alarm registers

which have their AE bit set at logic 1 will be ignored.

Table 16 Minute alarm register bits description(address 09H)

Table 17 Hour alarm register bits description(address 0AH)

Table 18 Day alarm register bits description(address 0BH)

Table 19 Weekday alarm register bits description(address 0CH)