PCF2129AT datasheet(29/86 Pages) PHILIPS

29 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

29 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

8.8.6 Register Months

Table 33.

Months - months register (address 08h) 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

MONTHS (1 to 12)

Reset

value

XXX

Table 34.

Months - months register (address 08h) 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

Place value Description

7to5

unused

MONTHS

0 to 1

ten’s place

actual month coded in BCD format, see Table 35

3to0

0 to9

unit place

Table 35.

Month assignments in BCD format

Month

Upper-digit

(ten’s place)

Digit (unit place)

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

January

000

February

March

000

April

001

May

001

June

001

July

001

August

010

September

October

100

November

100

December

100

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