PCF2127TSLASH2Y datasheet(33/100 Pages) PHILIPS

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PCF2127

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Product data sheet

Rev. 8 — 19 December 2014

33 of 100

NXP Semiconductors

PCF2127

Accurate RTC with integrated quartz crystal for industrial applications

8.9.5 Register Weekdays

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

PCF2127 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 36.

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 37.

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 38

Table 38.

Weekday assignments

Day[1]

Bit

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

110

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