PCF8563TS Philips Semiconductors, PCF8563TS Datasheet - Page 10

• Manufacturer Part Number: PCF8563TS
• Description: Real-time clock/calendar
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 04855
Product specification
8.6.5 Alarm registers
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 19: Minute alarm register bits description (address 09H)
Table 20: Hour alarm register bits description (address 0AH)
Table 21: Day alarm register bits description (address 0BH)
Table 22: Weekday alarm register bits description (address 0CH)
Bit
7
6 to 0 <minute alarm> These bits represents the minute alarm information coded in BCD
Bit
7
6 to 0 <hour alarm>
Bit
7
6 to 0 <day alarm>
Bit
7
6 to 0 <weekday alarm> These bits represents the weekday alarm information
Symbol
AE
Symbol
AE
Symbol
AE
Symbol
AE
Description
AE = 0; minute alarm is enabled. AE = 1; minute alarm is disabled.
format; value = 00 to 59.
Description
AE = 0; hour alarm is enabled. AE = 1; hour alarm is disabled.
These bits represents the hour alarm information coded in BCD
format; value = 00 to 23.
Description
AE = 0; day alarm is enabled. AE = 1; day alarm is disabled.
These bits represents the day alarm information coded in BCD
format; value = 01 to 31.
16 April 1999
Description
AE = 0; weekday alarm is enabled.
AE = 1; weekday alarm is disabled.
value 0 to 6.
Real-time clock/calendar
© Philips Electronics N.V. 1999. All rights reserved.
PCF8563
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