CBC34123 EnerChip™ RTC

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DS-72-31 V.13

Page 8 of 14

Preliminary

CBC34123 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.

Bit positions labeled as ‘-’ are not implemented and will return a ‘0’ when read. The bit position labeled as ‘--’ is

not implemented and will return a ‘0’ or ‘1’ when read. Bit positions labeled with N should always be written with

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]