PCF2129AT datasheet(6/68 Pages) NXP

6 / 68 page

PCF2129A_1

Product data sheet

Rev. 01 — 13 January 2010

6 of 68

NXP Semiconductors

PCF2129A

Integrated RTC, TCXO and quartz crystal

• Address registers 1Ah and 1Bh are for internal use only.

• The registers Seconds, Minutes, Hours, Days, Months, and Years are all coded in

Binary Coded Decimal (BCD) format to simplify application use. Other registers are

either bit-wise or standard binary.

When one of the RTC registers is read, the content of all counters is temporarily frozen.

This prevents a faulty reading of the clock and calendar during a carry condition (see

Section 8.8.8).

Fig 3.

Handling address registers

001aaj398

address register

00h

auto-increment

wrap around

01h

02h

03h

...

19h

1Ah

1Bh

Table 4.

Bit positions labeled as - are not implemented and will return 0 when read. Bits labeled as T must always be written with

logic 0. Bits labeled as X are undefined at power-on and unchanged by subsequent resets.

Address Register name

Bit

Reset value

Control registers

00h

Control_1

EXT_

TEST

TSTOP

TSF1

POR_

OVRD

12_24

0000 0000

01h

Control_2

MSF

WDTF

TSF2

TSIE

AIE

0000 0000

02h

Control_3

PWRMNG[2:0]

BTSE

BLF

BIE

BLIE

0000 0000

Time and date registers

03h

Seconds

OSF

SECONDS (0 to 59)

1XXX XXXX

04h

Minutes

MINUTES (0 to 59)

- XXX XXXX

05h

Hours

AMPM

HOURS (1 to 12) in 12 h mode

- - XX XXXX

HOURS (0 to 23) in 24 h mode

- - XX XXXX

06h

Days

DAYS (1 to 31)

- - XX XXXX

07h

Weekdays

-----WEEKDAYS (0 to 6)

- - - - - XXX

08h

Months

---MONTHS (1 to 12)

- - - X XXXX

09h

Years

YEARS (0 to 99)

XXXX XXXX

Alarm registers

0Ah

Second_alarm

AE_S

SECOND_ALARM (0 to 59)

1XXX XXXX

0Bh

Minute_alarm

AE_M

MINUTE_ALARM (0 to 59)

1XXX XXXX

0Ch

Hour_alarm

AE_H

AMPM

HOUR_ALARM (1 to 12) in 12 h mode

1 - XX XXXX

HOUR_ALARM (0 to 23) in 24 h mode

1 - XX XXXX

0Dh

Day_alarm

AE_D

DAY_ALARM (1 to 31)

1 - XX XXXX

0Eh

Weekday_alarm

AE_W

----WEEKDAY_ALARM (0 to 6) 1 - - - - XXX

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