PCF8564A datasheet(29/86 Pages) NXP

29 / 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

0 to 1

ten’s place

3 to 0

HOURS

0 to 9

unit place

actual hours 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

HOURS

0 to 9

unit place

actual hours coded in BCD format when in 24-hour

mode

Table 34. Hours - hours register (address 09h) bit description...continued

[1]

Hour mode is set by the bit 12_24 in register Control_1 (see Table 6).

7.9.5 Register Days

Bits labeled as T are unused and return 0 when read

Bit

Symbol

DAYS (1 to 31)

Reset

value

Table 35. Days - days register (address 0Ah) bit allocation

Bit

Symbol

Value

Place value Description

7 to 6

unused

5 to 4

0 to 3

ten’s place

3 to 0

DAYS[1]

0 to 9

unit place

actual day coded in BCD format

Table 36. Days - days register (address 0Ah) bit description

[1]

If the year counter contains a value which is exactly divisible by 4, excluding the year 00, the RTC compensates for leap years by adding a 29th day to

February. Note that next time the year will roll over to 00 will be year 2100, which is not going to be leap year.

7.9.6 Register Weekdays

Bits labeled as T are unused and return 0 when read

Bit

Symbol

WEEKDAYS (0 to 6)

Reset

value

Table 37. Weekdays - weekdays register (address 0Bh) bit allocation

Bits labeled as T are unused and return 0 when read

Bit

Symbol

Value

Description

7 to 3

000

unused

2 to 0

WEEKDAYS

0 to 6

actual weekday value, see Table 39

Table 38. Weekdays - weekdays register (address 0Bh) bit description

PCA2131

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

Product data sheet

Rev. 1.0 — 26 July 2021

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