PCF8564A datasheet(43/86 Pages) NXP

43 / 86 page

NXP Semiconductors

PCA2131

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

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

Bit

Symbol

Value

Place value Description

7 to 6

unused

12-hour mode[1]

indicates AM

AMPM

indicates PM

0 to 1

ten’s place

3 to 0

HOUR_TIMESTP

0 to 9

unit place

hour timestamp information coded in BCD format

when in 12-hour mode

24-hour mode[1]

5 to 4

0 to 2

ten’s place

3 to 0

HOUR_TIMESTP

0 to 9

unit place

hour timestamp information coded in BCD format

when in 24-hour mode

Table 71. Hour_timestp1/2/3/4 - hour timestamp register (address 17h/1Eh/25h/2Ch) bit description

[1]

Hour mode is set by the bit 12_24 in register Control_1.

7.12.3.5 Register Day_timestp

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

Bit

Symbol

DAY_TIMESTP (1 to 31)

Reset

value

Table 72. Day_timestp1/2/3/4 - day timestamp register (address 18h/1Fh/26h/2Dh) bit allocation

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

Bit

Symbol

Value

Place value Description

7 to 6

unused

5 to 4

0 to 3

ten’s place

3 to 0

DAY_TIMESTP

0 to 9

unit place

day timestamp information coded in BCD format

Table 73. Day_timestp1/2/3/4 - day timestamp register (address 18h/1Fh/26h/2Dh) bit description

7.12.3.6 Register Mon_timestp

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

Bit

Symbol

MONTH_TIMESTP (1 to 12)

Reset

value

Table 74. Mon_timestp1/2/3/4 - month timestamp register (address 19h/20h/27h/2Eh) bit allocation

PCA2131

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 1.0 — 26 July 2021

43 / 86

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