PCF2129 datasheet(27/86 Pages) PHILIPS

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PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

27 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

8.8.3 Register Hours

[1]

Hour mode is set by the bit 12_24 in register Control_1 (see Table 7).

8.8.4 Register Days

[1]

If the year counter contains a value which is exactly divisible by 4, including the year 00, the RTC compensates for leap years by adding

a 29th day to February.

Table 26.

Hours - hours register (address 05h) 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

AMPM

HOURS (1 to 12) in 12-hour mode

HOURS (0 to 23) in 24-hour mode

Reset

value

XXX

Table 27.

Hours - hours register (address 05h) 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

7to6

unused

12-hour mode[1]

AMPM

indicates AM

indicates PM

HOURS

0 to 1

ten’s place

actual hours coded in BCD format when in 12-hour

mode

3to0

0 to9

unit place

24-hour mode[1]

5 to 4

HOURS

0 to 2

ten’s place

actual hours coded in BCD format when in 24-hour

mode

3to0

0 to9

unit place

Table 28.

Days - days register (address 06h) 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

DAYS (1 to 31)

Reset

value

XXX

Table 29.

Days - days register (address 06h) bit description

Bit

Symbol

Value

Place value Description

7to6

unused

5to4

DAYS[1]

0 to 3

ten’s place

actual day coded in BCD format

3to0

0 to9

unit place

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