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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PCF2127AT/1 데이터시트(PDF) 34 Page - NXP Semiconductors |
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PCF2127AT/1 데이터시트(HTML) 34 Page - NXP Semiconductors |
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34 / 80 page  PCF2127A_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 34 of 80 NXP Semiconductors PCF2127A Integrated RTC, TCXO and quartz crystal 8.10.5 Register Weekday_alarm [1] Default value. 8.10.6 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 8.11.6 Alarm registers which have their alarm enable bit AE_x at logic 1 are ignored. Table 33. 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 20. Alarm flag timing diagram 001aaf903 44 45 45 minute alarm minutes counter AF INT when AIE = 1 46 |
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