PCF8564A datasheet(9/86 Pages) NXP

9 / 86 page

NXP Semiconductors

PCA2131

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

Bit positions labeled as T are unused and return 0 when read. Bits labeled as X are undefined at power-on and unchanged by subsequent resets.

Bit

Address

Reset value

Reference

28h

Year_timestp3

YEAR_TIMESTP (0 to 99)

0000 0000

Table 76

Timestamp4 registers

29h

Timestp_ctl4

TSM

TSOFF

SUBSEC_TIMESTP[4:0]

0000 0000

Table 64

2Ah

Sec_timestp4

SECOND_TIMESTP (0 to 59)

0000 0000

Table 66

2Bh

Min_timestp4

MINUTE_TIMESTP (0 to 59)

0000 0000

Table 68

AMPM

HOUR_TIMESTP (1 to 12) in 12-hour mode

0000 0000

2Ch

Hour_timestp4

HOUR_TIMESTP (0 to 23) in 24-hour mode

0000 0000

Table 70

2Dh

Day_timestp4

DAY_TIMESTP (1 to 31)

0000 0000

Table 72

2Eh

Mon_timestp4

MONTH_TIMESTP (1 to 12)

0000 0000

Table 74

2Fh

Year_timestp4

YEAR_TIMESTP (0 to 99)

0000 0000

Table 76

Aging offset register

30h

Aging_offset

AO[3:0]

0000 1000

Table 19

Interrupt mask registers

31h

INT_A_MASK1

MIA

SIA

WD_CDA

AIEA

BIEA

BLIEA

0011 1111

Table 80

32h

INT_A_MASK2

TSIE1A

TSIE2A

TSIE3A

TSIE4A

0000 1111

Table 80

33h

INT_B_MASK1

MIB

SIB

WD_CDB

AIEB

BIEB

BLIEB

0011 1111

Table 82

34h

INT_B_MASK2

TSIE1B

TSIE2B

TSIE3B

TSIE4B

0000 1111

Table 82

Watchdog registers

35h

Watchdg_tim_ctl

WD_CD

TI_TP

TF[1:0]

0000 0011

Table 55

36h

Watchdg_tim_val

WATCHDG_TIM_VAL[7:0]

0000 0000

Table 57

Table 4. Register overview...continued

PCA2131

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Product data sheet

Rev. 1.0 — 26 July 2021

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