PCF2123 datasheet(48/86 Pages) NXP

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NXP Semiconductors

PCA2131

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

The interrupt is cleared when the flag WDTF is reset. Instructions for clearing it can be

found in Section 7.11.5.

7.13.4 Alarm interrupts

Generation of interrupts from the alarm function is controlled by the bit AIE (register

Control_2). If AIE is enabled, the INTA/B pin follows the status of bit AF (register

Control_2) if not masked. Clearing AF immediately clears INTA/B. No pulse generation is

possible for alarm interrupts.

aaa-041574

minute counter

minute alarm

INTA/B

SCL

instruction

CLEAR INSTRUCTION

8th clock

Example where only the minute alarm is used and no other interrupts are enabled.

Figure 21. AF timing diagram

7.13.5 Timestamp interrupts

Interrupt generation from the timestamp function is controlled using the TSIE1-4 bit

(register Control_5). If TSIE1-4 is enabled, the INTA/B pin follows the status of the flags

TSF1/2/3/4, if not masked. Clearing the flags TSFx immediately clears INTA/B. No pulse

generation is possible for timestamp interrupts.

7.13.6 Battery switch-over interrupts

Generation of interrupts from the battery switch-over is controlled by the BIE bit (register

Control_3). If BIE is enabled, the INTA/B pin follows the status of bit BF in register

Control_3 if not masked(see Table 78). Clearing BF immediately clears INTA/B. No pulse

generation is possible for battery switch-over interrupts.

7.13.7 Battery low detection interrupts

Generation of interrupts from the battery low detection is controlled by the BLIE bit

(register Control_3). If BLIE is enabled, the INTA/B pin follows the status of bit BLF

(register Control_3) if not masked. The interrupt is cleared when the battery is replaced

(BLF is logic 0) or when bit BLIE is disabled (BLIE is logic 0). BLF is read only and

therefore cannot be cleared by command.

PCA2131

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Product data sheet

Rev. 1.0 — 26 July 2021

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