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PCA2129T/Q900/2 Datasheet(PDF) 31 Page - NXP Semiconductors |
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PCA2129T/Q900/2 Datasheet(HTML) 31 Page - NXP Semiconductors |
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31 / 84 page  PCA2129 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 5 — 19 December 2014 31 of 84 NXP Semiconductors PCA2129 Automotive accurate RTC with integrated quartz crystal As a consequence of this method, it is very important to make a read or write access in one go. That is, setting or reading seconds through to years should be made in one single access. Failing to comply with this method could result in the time becoming corrupted. As an example, if the time (seconds through to hours) is set in one access and then in a second access the date is set, it is possible that the time may increment between the two accesses. A similar problem exists when reading. A roll-over may occur between reads thus giving the minutes from one moment and the hours from the next. Therefore it is advised to read all time and date registers in one access. Fig 15. Access time for read/write operations |
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