PCF2123 datasheet(46/86 Pages) NXP

46 / 86 page

NXP Semiconductors

PCA2131

Nano-power highly accurate RTC with integrated quartz crystal for automotive applications

Control_1. However, a minute interrupt enabled on top of a second interrupt cannot be

distinguishable since it occurs at the same time.

The minute/second flag MSF (register Control_2) is set logic 1 when either the seconds

or the minutes counter increments according to the enabled interrupt (see Table 79). The

MSF flag can be cleared by command.

Result on INTA/B

Result on MSF

no interrupt generated

MSF never set

an interrupt once per minute

MSF set when

minutes

counter increments

an interrupt once per second

MSF set when

seconds

counter increments

an interrupt once per second

MSF set when

seconds

counter increments

Table 79. Effect of bits MI and SI on pin INTA/B and bit MSF

When MSF is set logic 1:

• If TI_TP is logic 1, the interrupt is generated as a pulsed signal if not masked.

• If TI_TP is logic 0, the interrupt is permanently active signal that remains until MSF is

cleared.

aaa-041610

seconds counter

minutes counter

INTA/B when SI enabled

MSF when SI enabled

INTA/B when only MI enabled

MSF when only MI enabled

In this example, bit TI_TP is logic 1 and the MSF flag is not cleared after an interrupt.

Figure 18. INTA/B example for SI and MI when TI_TP is logic 1

PCA2131

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Product data sheet

Rev. 1.0 — 26 July 2021

46 / 86

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