PCF2129AT datasheet(23/68 Pages) NXP

23 / 68 page

PCF2129A_1

Product data sheet

Rev. 01 — 13 January 2010

23 of 68

NXP Semiconductors

PCF2129A

Integrated RTC, TCXO and quartz crystal

8.8.3 Register Hours

[1]

Hour mode is set by the bit 12_24 in register Control_1.

8.8.4 Register Days

[1]

The RTC compensates for leap years by adding a 29th day to February if the year counter contains a value

which is exactly divisible by 4, including the year 00.

8.8.5 Register Weekdays

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

PCF2129A will assume Sunday is 000 and Monday is 001 for the purposes of determining

the increment for calendar weeks.

[1]

These bits may be re-assigned by the user.

Table 18.

Hours - hours register (address 05h) bit description

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

0to9

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

0to9

unit place

Table 19.

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

0to9

unit place

Table 20.

Weekdays - weekdays register (address 07h) bit description

Bit

Symbol

Value

Description

7to3 -

unused

2 to 0 WEEKDAYS

0 to 6

actual weekday value, see Table 21

Table 21.

Weekday assignments

Day[1]

Bit

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

110

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