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PCF85063TP Datasheet(PDF) 17 Page - NXP Semiconductors |
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PCF85063TP Datasheet(HTML) 17 Page - NXP Semiconductors |
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17 / 46 page ![]() PCF85063TP All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 2 — 15 April 2013 17 of 46 NXP Semiconductors PCF85063TP Tiny Real-Time Clock/calendar [1] Default value. 8.3.1.1 OS: Oscillator stop When the oscillator of the PCF85063TP is stopped, the OS flag is set. The oscillator can be stopped, for example, by connecting one of the oscillator pins OSCI or OSCO to ground. The oscillator is considered to be stopped during the time between power-on and stable crystal resonance. This time can be in the range of 200 ms to 2 s depending on crystal type, temperature, and supply voltage. The flag remains set until cleared by command (see Figure 10). If the flag cannot be cleared, then the oscillator is not running. This method can be used to monitor the oscillator and to determine if the supply voltage has reduced to the point where oscillation fails. Table 20. Seconds coded in BCD format Seconds value in decimal Upper-digit (ten’s place) Digit (unit place) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00[1] 000 0000 01 000 0001 02 000 0010 : ::: :::: 09 000 1001 10 001 0000 : ::: :::: 58 101 1000 59 101 1001 Fig 10. OS flag DDD W 26 DQGIODJFDQQRWEHFOHDUHG 9'' RVFLOODWLRQ RVFLOODWLRQQRZVWDEOH 26IODJFOHDUHG E\VRIWZDUH 26IODJVHWZKHQ RVFLOODWLRQVWRSV 26IODJ 26 DQGIODJFDQEHFOHDUHG |
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