PC8523-1 データシートの表示（PDF） - NXP Semiconductors.

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PC8523-1

Real-Time Clock (RTC) and calendar

NXP Semiconductors. 

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).

DGGUHVVUHJLVWHU

K

K

K

K



K

K

K

DXWRLQFUHPHQW

ZUDSDURXQG

DDD

Fig 6. Auto-incrementing of the registers

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

7

6

5

4

3

2

1

0

Control registers

00h

Control_1

CAP_SEL T

STOP SR

12_24 SIE

AIE

CIE

01h

Control_2

WTAF CTAF CTBF SF

AF

WTAIE CTAIE CTBIE

02h

Control_3

PM[2:0]

-

BSF

BLF

BSIE

BLIE

Time and date registers

03h

Seconds

OS

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

AEN_M MINUTE_ALARM (0 to 59)

0Bh

Hour_alarm

AEN_H -

AMPM HOUR_ALARM (1 to 12 in 12 hour mode)

-

HOUR_ALARM (0 to 23 in 24 hour mode)

0Ch

Day_alarm

AEN_D -

DAY_ALARM (1 to 31)

0Dh

Weekday_alarm

AEN_W -

-

-

-

WEEKDAY_ALARM (0 to 6)

Offset register

0Eh

Offset

MODE OFFSET[6:0]

PCF8523

Product data sheet

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

Rev. 7 — 28 April 2015

© NXP Semiconductors N.V. 2015. All rights reserved.

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