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PCF8523TS/1 Datasheet(PDF) 27 Page - NXP Semiconductors

Part # PCF8523TS/1
Description  Real-Time Clock (RTC) and calendar
PDF  75 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8523TS/1 Datasheet(HTML) 27 Page - NXP Semiconductors

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PCF8523
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 5 July 2012
27 of 74
NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
8.7.6 Alarm interrupts
Generation of interrupts from the alarm function is controlled via the bit AIE (register
Control_1). If AIE is enabled, the INT1 follows the status of bit AF (register Control_2).
Clearing AF immediately clears INT1. No pulse generation is possible for alarm interrupts.
Example where only the minute alarm is used and no other interrupts are enabled.
Fig 17. AF timing
013aaa335
44
45
minute counter
minute alarm
AF
INT1
SCL
instruction
45
CLEAR INSTRUCTION



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