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PCF85263ATL/A Datasheet(PDF) 17 Page - NXP Semiconductors |
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PCF85263ATL/A Datasheet(HTML) 17 Page - NXP Semiconductors |
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17 / 102 page  NXP Semiconductors PCF85263A Tiny RTC/Calendar with Alarm Function, Battery Switch-Over, Time Stamp Input, and I2C-bus aaa-009580 SECONDS 100 Hz tick MINUTES HOURS 12_24 DAYS WEEKDAY LEAP YEAR CALCULATION MONTHS YEARS 100TH_SECOND 100TH 1 Hz tick Figure 11. Data flow for the time function During read operations, the time counting circuits (memory locations 00h through 07h) are copied into an output register. The RTC continues counting in the background. When reading or writing the time, it is important to make a read or write access in one go, that is, setting or reading 100th seconds through to years must 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 increments between the two accesses. A similar problem exists when reading. A roll-over can occur between reads, therefore giving the minutes from one moment and the hours from the next. Before setting the time, the STOP bit must be set and the prescalers must be cleared (for details, see Section 7.16). An example of setting the time: 14 hours, 23 minutes, and 19 seconds. • I2C START condition • I2C target address + write (A2h) • Register address (2Eh) • Write data (set STOP, 01h) • Write data (clear prescaler, A4h) • Write data (100th seconds, 00h) • Write data (Hours, 14h) • Write data (Minutes, 23h) • Write data (Seconds, 19h) • I2C START condition • I2C target address + write (A2h) • Register address (2Eh) PCF85263A All information provided in this document is subject to legal disclaimers. © 2025 NXP B.V. All rights reserved. Product data sheet Rev. 5.4 — 12 December 2025 Document feedback 17 / 102 |
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