PCF2127AT/1 NXP [NXP Semiconductors], PCF2127AT/1 Datasheet - Page 34

• Manufacturer Part Number: PCF2127AT/1
• Description: Integrated RTC, TCXO and quartz crystal
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF2127A_2
Product data sheet
8.10.5 Register Weekday_alarm
8.10.6 Alarm flag
Table 33.
[1]
When all enabled comparisons first match, the alarm flag AF (register Control_2) is set.
AF will remain set until cleared by using the interface. Once AF has been cleared it will
only be set again when the time increments to match the alarm condition once more. For
clearing the flags see
Alarm registers which have their alarm enable bit AE_x at logic 1 are ignored.
Bit
7
6 to 3 -
2 to 0 WEEKDAY_ALARM
Fig 20. Alarm flag timing diagram
Default value.
Symbol
AE_W
Example where only the minute alarm is used and no other interrupts are enabled.
Weekday_alarm - weekday alarm register (address 0Eh) bit description
All information provided in this document is subject to legal disclaimers.
INT when AIE = 1
minutes counter
minute alarm
Section 8.11.6
Rev. 02 — 7 May 2010
AF
Value
0
1
-
0 to 6
[1]
44
45
Description
weekday alarm is enabled
weekday alarm is disabled
unused
weekday alarm information
Integrated RTC, TCXO and quartz crystal
45
PCF2127A
001aaf903
46
© NXP B.V. 2010. All rights reserved.
34 of 80