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PCF85263ATL/A Datasheet(PDF) 30 Page - NXP Semiconductors |
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PCF85263ATL/A Datasheet(HTML) 30 Page - NXP Semiconductors |
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30 / 102 page  NXP Semiconductors PCF85263A Tiny RTC/Calendar with Alarm Function, Battery Switch-Over, Time Stamp Input, and I2C-bus Bit Symbol Value Description Timestamp2 (TSR2) timestamp register 2 mode 000 [1] no timestamp 001 FB, record First-time switch to Battery event 010 LB, record Last-time switch to Battery event 011 LV, record Last-time switch to VDD event 100 FE, record First TS pin Event 101 LE, record Last TS pin Event 4 to 2 TSR2M[2:0] 110 to 111 no timestamp Timestamp1 (TSR1) timestamp register 1 mode 00 [1] no timestamp 01 FE, record First TS pin Event 10 LE, record Last TS pin Event 1 to 0 TSR1M[1:0] 11 no timestamp Table 19. TSR_mode - timestamp mode control register (address 23h) bit description...continued [1] Default value. The First event means that the time is only stored on the first event and not recorded for subsequent events. When the first event occurs, the associated timestamp flag is set. When the flag is cleared, then a new ‘first’ event is recorded. See Figure 18 and Figure 19. The Last event means that the time is stored on every event. When an event occurs, the associated timestamp flag is set. It is not necessary to clear the flag before a new event is recorded. Interrupts can be generated in INTA pin and/or INTB pin. Interrupts are generated every time a timestamp register is updated. Interrupt generation is not conditional on the state of the timestamp flags. See Section 7.7.1. source of power VDD power battery power VDD power battery power VDD power t1 t2 t3 t4 t5 FB, LB LV FB, LB LV LB no change TSR2 = t2 TSR2 set to last time switch to VDD , LV TSR3 set to first time switch to battery, FB no change TSR2 = t4 no change TSR3 = t1 TSR3 = t3 no change no change no change event type event time aaa-009596 timestamp3 flag, TSR3F flag cleared by interface Figure 18. Example battery switch-over timestamp 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 30 / 102 |
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