PCF2123TS datasheet(8/63 Pages) NXP

8 / 63 page

PCF2123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 5 — 27 April 2011

8 of 63

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.

[1]

Except in the case of software reset, see Section 8.3.1.1.

Table 4.

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

Bit

Control and status registers

00h

Control_1

EXT_TEST

STOP

12_24

CIE

01h

Control_2

MSF

TI_TP

AIE

TIE

Time and date registers

02h

Seconds

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]

CTD[1:0]

0Fh

Countdown_timer

COUNTDOWN_TIMER[7:0]

PCF2123TS 数据表(PDF) 8 Page - NXP Semiconductors

PCF2123TS 数据表(HTML) 8 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63

数据表下载