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PCF2129A Datasheet(PDF) 29 Page - NXP Semiconductors

No. de pieza PCF2129A
Descripción Electrónicos  Integrated RTC, TCXO and quartz crystal
PDF  69 Pages
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Fabricante Electrónico  NXP [NXP Semiconductors]
Página de inicio  http://www.nxp.com
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PCF2129A Datasheet(HTML) 29 Page - NXP Semiconductors

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PCF2129A_2
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 7 May 2010
29 of 69
NXP Semiconductors
PCF2129A
Integrated RTC, TCXO and quartz crystal
8.9.5 Register Weekday_alarm
[1]
Default value.
8.9.6 Alarm flag
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 Section 8.10.5
Alarm registers which have their alarm enable bit AE_x at logic 1 are ignored.
Table 29.
Weekday_alarm - weekday alarm register (address 0Eh) bit description
Bit
Symbol
Value
Description
7
AE_W
0
weekday alarm is enabled
1[1]
weekday alarm is disabled
6to3 -
-
unused
2 to 0 WEEKDAY_ALARM
0 to 6
weekday alarm information
Example where only the minute alarm is used and no other interrupts are enabled.
Fig 16. Alarm flag timing diagram
001aaf903
44
45
45
minute alarm
minutes counter
AF
INT when AIE = 1
46



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