PCF2129AT NXP [NXP Semiconductors], PCF2129AT Datasheet - Page 6

• Manufacturer Part Number: PCF2129AT
• Description: Integrated RTC, TCXO and quartz crystal
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
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.
PCF2129A_1
Product data sheet
Address Register name
Control registers
00h
01h
02h
Time and date registers
03h
04h
05h
06h
07h
08h
09h
Alarm registers
0Ah
0Bh
0Ch
0Dh
0Eh
Control_1
Control_2
Control_3
Seconds
Minutes
Hours
Days
Weekdays
Months
Years
Second_alarm
Minute_alarm
Hour_alarm
Day_alarm
Weekday_alarm
Register overview
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
Fig 3.
•
•
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.
Bit
7
EXT_
TEST
MSF
PWRMNG[2:0]
OSF
-
-
-
-
-
YEARS (0 to 99)
AE_S
AE_M
AE_H
AE_D
AE_W
8.8.8).
Handling address registers
6
T
WDTF
SECONDS (0 to 59)
MINUTES (0 to 59)
-
-
-
-
SECOND_ALARM (0 to 59)
MINUTE_ALARM (0 to 59)
-
-
-
Rev. 01 — 13 January 2010
5
STOP
TSF2
AMPM
HOURS (0 to 23) in 24 h mode
DAYS (1 to 31)
-
-
AMPM
HOUR_ALARM (0 to 23) in 24 h mode
DAY_ALARM (1 to 31)
-
address register
4
TSF1
AF
BTSE
HOURS (1 to 12) in 12 h mode
-
MONTHS (1 to 12)
HOUR_ALARM (1 to 12) in 12 h mode
-
1Ah
1Bh
00h
01h
02h
03h
19h
...
3
POR_
OVRD
T
BF
-
-
auto-increment
Integrated RTC, TCXO and quartz crystal
2
12_24
TSIE
BLF
WEEKDAYS (0 to 6)
WEEKDAY_ALARM (0 to 6) 1 - - - - XXX
wrap around
001aaj398
1
MI
AIE
BIE
PCF2129A
0
SI
T
BLIE
© NXP B.V. 2010. All rights reserved.
Reset value
0000 0000
0000 0000
1XXX XXXX
- - XX XXXX
- - XX XXXX
- - - - - XXX
- - - X XXXX
XXXX XXXX
1XXX XXXX
1 - XX XXXX
0000 0000
- XXX XXXX
- - XX XXXX
1XXX XXXX
1 - XX XXXX
1 - XX XXXX
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