PCA2129 datasheet(28/84 Pages) NXP

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PCA2129

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Product data sheet

Rev. 5 — 19 December 2014

28 of 84

NXP Semiconductors

PCA2129

Automotive accurate RTC with integrated quartz crystal

8.8.5 Register Weekdays

Although the association of the weekdays counter to the actual weekday is arbitrary, the

PCA2129 assumes that Sunday is 000 and Monday is 001 for the purpose of determining

the increment for calendar weeks.

[1]

Definition may be reassigned by the user.

Table 30.

Weekdays - weekdays register (address 07h) bit allocation

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

WEEKDAYS (0 to 6)

Reset

value

---

Table 31.

Weekdays - weekdays register (address 07h) bit description

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

Value

Description

7 to 3

unused

2 to 0

WEEKDAYS

0 to 6

actual weekday value, see Table 32

Table 32.

Weekday assignments

Day[1]

Bit

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

110

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