PCF2123U/10AA/1 查看數據表（PDF） - NXP Semiconductors.
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PCF2123U/10AA/1 Datasheet PDF : 64 Pages
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NXP Semiconductors
PCF2123
SPI Real time clock/calendar
8.2 Register overview
16 registers are available. The time registers are encoded in the Binary Coded Decimal
(BCD) format to simplify application use. Other registers are either bit-wise or standard
binary.
Table 5. Registers overview
Bit positions labelled as - are not implemented and will return a 0 when read. The bit position labelled as -- is not implemented
and will return a 0 or 1 when read. Bit positions labelled with N should always be written with logic 0[1].
Address Register name Bit
7
6
5
4
3
2
1
0
Control and status registers
00h
Control_1
EXT_TEST N
STOP SR
N
12_24 CIE
N
01h
Control_2
MI
SI
MSF
TI_TP AF
TF
AIE
TIE
Time and date registers
02h
Seconds
OS
SECONDS (0 to 59)
03h
Minutes
--
MINUTES (0 to 59)
04h
Hours
-
-
AMPM HOURS (1 to 12) in 12 h mode
HOURS (0 to 23) in 24 h mode
05h
Days
-
-
DAYS (1 to 31)
06h
Weekdays
-
-
-
-
-
WEEKDAYS (0 to 6)
07h
Months
-
-
-
MONTHS (1 to 12)
08h
Years
YEARS (0 to 99)
Alarm registers
09h
Minute_alarm
AE_M
MINUTE_ALARM (0 to 59)
0Ah
Hour_alarm
AE_H
-
AMPM HOUR_ALARM (1 to 12) in 12 h mode
HOUR_ALARM (0 to 23) in 24 h mode
0Bh
Day_alarm
AE_D
-
DAY_ALARM (1 to 31)
0Ch
Weekday_alarm AE_W
-
-
-
-
WEEKDAY_ALARM (0 to 6)
Offset register
0Dh
Offset_register MODE
OFFSET[6:0]
Timer registers
0Eh
Timer_clkout
-
COF[2:0]
TE
-
CTD[1:0]
0Fh
Countdown_timer COUNTDOWN_TIMER[7:0]
[1] Except in the case of software reset, see Section 8.3.1.1.
PCF2123
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 15 July 2013
© NXP B.V. 2013. All rights reserved.
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