PCF8523_12 datasheet(7/75 Pages) NXP

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PCF8523

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Product data sheet

Rev. 4 — 5 July 2012

7 of 74

NXP Semiconductors

PCF8523

Real-Time Clock (RTC) and calendar

8.1 Registers overview

The 20 registers of the PCF8523 are auto-incrementing after each read or write data byte

up to register 13h. After register 13h, the auto-incrementing will wrap around to address

00h (see Figure 6).

Fig 6.

Auto-incrementing of the registers

013aaa309

address register

00h

auto-increment

wrap around

01h

02h

03h

...

11h

12h

13h

Table 6.

Registers overview

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

Address Register name

Bit

Control registers

00h

Control_1

CAP_SEL T

STOP

12_24

SIE

AIE

CIE

01h

Control_2

WTAF

CTAF

CTBF

WTAIE

CTAIE

CTBIE

02h

Control_3

PM[2:0]

BSF

BLF

BSIE

BLIE

Time and date registers

03h

Seconds

SECONDS (0 to 59)

04h

Minutes

MINUTES (0 to 59)

05h

Hours

AMPM

HOURS (1 to 12 in 12 hour mode)

HOURS (0 to 23 in 24 hour mode)

06h

Days

DAYS (1 to 31)

07h

Weekdays

WEEKDAYS (0 to 6)

08h

Months

MONTHS (1 to 12)

09h

Years

YEARS (0 to 99)

Alarm registers

0Ah

Minute_alarm

AE_M

MINUTE_ALARM (0 to 59)

0Bh

Hour_alarm

AE_H

AMPM

HOUR_ALARM (1 to 12 in 12 hour mode)

HOUR_ALARM (0 to 23 in 24 hour mode)

0Ch

Day_alarm

AE_D

DAY_ALARM (1 to 31)

0Dh

Weekday_alarm

AE_W

WEEKDAY_ALARM (0 to 6)

Offset register

0Eh

Offset

MODE

OFFSET[6:0]

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