PCF2129AT NXP [NXP Semiconductors], PCF2129AT Datasheet - Page 7

• 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
CLKOUT control register
0Fh
Watchdog registers
10h
11h
Timestamp registers
12h
13h
14h
15h
16h
17h
18h
Aging offset register
19h
Internal registers
1Ah
1Bh
CLKOUT_ctl
Watchdg_tim_ctl
Watchdg_tim_val WATCHDG_TIM_VAL[7:0]
Timestp_ctl
Sec_timestp
Min_timestp
Hour_timestp
Day_timestp
Mon_timestp
Year_timestp
Aging_offset
Internal_reg
Internal_reg
Register overview
Bit
7
TCR[1:0]
WD_CD T
TSM
-
-
-
-
-
YEAR_TIMESTP (0 to 99)
-
-
-
…continued
6
TSOFF
SECOND_TIMESTP (0 to 59)
MINUTE_TIMESTP (0 to 59)
-
-
-
-
-
-
Rev. 01 — 13 January 2010
5
-
TI_TP
-
AMPM
HOUR_TIMESTP (0 to 23) in 24 h mode
DAY_TIMESTP (1 to 31)
-
-
-
-
4
-
-
1_O_16_TIMESTP[4:0]
HOUR_TIMESTP (1 to 12) in 12 h mode
MONTH_TIMESTP (1 to 12)
-
-
-
3
-
-
AO[3:0]
-
-
Integrated RTC, TCXO and quartz crystal
2
COF[2:0]
-
-
-
1
TF[1:0]
-
-
PCF2129A
0
-
-
© NXP B.V. 2010. All rights reserved.
Reset value
00 - - - 000
000 - - - 11
XXXX XXXX
00 - X XXXX
- XXX XXXX
- - XX XXXX
- - XX XXXX
- - XX XXXX
- - - X XXXX
XXXX XXXX
- - - - 1000
- - - - - - - -
- - - - - - - -
- XXX XXXX
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