Datasheet

PCF2129 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 7 — 19 December 2014 46 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
When MSF is set logic 1:
• If TI_TP is logic 1, the interrupt is generated as a pulsed signal.
• If TI_TP is logic 0, the interrupt is permanently active signal that remains until MSF is
cleared.
Table 72. Effect of bits MI and SI on pin INT and bit MSF
MI SI Result on INT Result on MSF
0 0 no interrupt generated MSF never set
1 0 an interrupt once per minute MSF set when minutes
counter increments
0 1 an interrupt once per second MSF set when seconds
counter increments
1 1 an interrupt once per second MSF set when seconds
counter increments
In this example, bit TI_TP is logic 1 and the MSF flag is not cleared after an interrupt.
Fig 22. INT example for SI and MI when TI_TP is logic 1
In this example, bit TI_TP is logic 0 and the MSF flag is cleared after an interrupt.
Fig 23. INT example for SI and MI when TI_TP is logic 0
DDI
   

VHFRQGVFRXQWHU
PLQXWHVFRXQWHU
,17ZKHQ6,HQDEOHG
06)ZKHQ6,HQDEOHG
,17ZKHQRQO\0,HQDEOHG
06)ZKHQRQO\0,HQDEOHG

 
DDJ
VHFRQGVFRXQWHU
PLQXWHVFRXQWHU
,17ZKHQ6,HQDEOH
06)ZKHQ6,HQDEOH
,17ZKHQRQO\0,HQDEOHG
06)ZKHQRQO\0,HQDEOHG
 

  
