PCF8564A datasheet(11/86 Pages) NXP

11 / 86 page

NXP Semiconductors

PCA2131

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

7.2.2 Register Control_2

Bits labeled as T are unused and return 0 when read.

Bit

Symbol

MSF

WDTF

AIE

Reset

value

Table 7. Control_2 - control and status register 2 (address 01h) bit allocation

Bits labeled as T are unused and return 0 when read.

Bit

Symbol

Value

Description

Reference

no minute or second interrupt generated

MSF

flag set when minute or second interrupt

generated;

flag must be cleared to clear interrupt

Section 7.13

no watchdog timer interrupt generated

WDTF

flag set when watchdog timer interrupt generated;

flag cannot be cleared by command (read-only)

Section 7.13.3

unused

no alarm interrupt triggered

flag set when alarm triggered;

flag must be cleared to clear interrupt

Section 7.10.6

3:2

unused

no interrupt generated from the alarm flag

AIE

interrupt generated when alarm flag set

Section 7.13.4

unused

Table 8. Control_2 - control and status register 2 (address 01h) bit description

7.2.3 Register Control_3

Bit

Symbol

PWRMNG[2:0]

BTSE

BLF

BIE

BLIE

Reset

value

Table 9. Control_3 - control and status register 3 (address 02h) bit allocation

PCA2131

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Product data sheet

Rev. 1.0 — 26 July 2021

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