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ISL12057

Low Cost and Low Power I2C RTC Real Time Clock/Calendar with Alarm Function and Dual IRQ Pins

Renesas Electronics 

ISL12057

REG

ADDR SECTION NAME

00H

RTC

SC

01H

MN

02H

HR

03H

DW

04H

DT

05H

MO

06h

YR

07h Alarm1 A1SC

08h

A1MN

09h

A1HR

0Ah

A1DW/

DT

0Bh Alarm2 A2MN

0Ch

A2HR

0Dh

A2DW/

DT

0Eh Control INT

0Fh Status

SR

7

0

0

0

0

0

CENTUR

Y

YR23

A1M1

A1M2

A1M3

A1M4

A2M2

A2M3

A2M4

EOSC

OSF

6

SC22

MN22

MIL

TABLE 1. REGISTER MEMORY MAP

BIT

5

4

3

2

SC21

SC20

SC13

SC12

MN21

MN20 MN13

MN12

AM/PM HR20

HR13

HR12

HR21

0

0

0

0

DW12

0

DT21

DT20

DT13

DT12

0

0

MO20 MO13 MO12

YR22

A1SC22

A1MN22

A1MIL

YR21

A1SC21

A1MN21

A1AM/PM

YR20

A1SC20

A1MN20

A1HR20

YR13

A1SC13

A1MN13

A1HR13

YR12

A1SC12

A1MN12

A1HR12

A1HR21

A1DW/DT

0

A1DT21

A2MN22 A2MN21

A2MIL A2AM/PM

0

A1DT20

A2MN20

A2HR20

0

A1DT13

A2MN13

A2HR13

A1DW12

A1DT12

A2MN12

A2HR12

A2DW/DT

0

0

A2HR21

0

A2DT21

0

0

0

A2DT20

RS2

0

0

A2DT13

RS1

0

A2DW12

A2DT12

INTCN

0

1

SC11

MN11

HR11

DW11

DT11

MO11

YR11

A1SC11

A1MN11

A1HR11

A1DW11

A1DT11

A2MN11

A2HR11

A2DW11

A2DT11

A2IE

A2F

0

SC10

MN10

HR10

DW10

DT10

MO10

YR10

A1SC10

A1MN10

A1HR10

A1DW10

A1DT10

A2MN10

A2HR10

A2DW10

A2DT10

A1IE

A1F

REG

RANGE DEFAULT

0-59

00h

0-59

00h

1-12

00h

+AM/PM

0-23

1-7

01h

1-31

01h

0-12

01h

+Century

0-99

00h

0-59

00h

0-59

00h

1-12

00h

+AM/PM

0-23

1-7

00h

1-31

00h

0-59

00h

1-12

00h

+AM/PM

0-23

1-7

00h

1-31

00h

N/A

18h

N/A

80h

Real-Time Clock Registers

Addresses [00h to 06h]

RTC REGISTERS (SC, MN, HR, DW, DT, MO, YR)

These registers depict BCD representations of the time. As

such, SC (Seconds, address 00h) and MN (Minutes, address

01h) range from 0 to 59, HR (Hour, address 02h) can either be

a 12-hour or 24-hour mode, DW (Day of the Week, address

03h) is 1 to 7, DT (Date, address 04h) is 1 to 31, MO (Month,

address 05h) is 1 to 12, and YR (Year, address 06h) is 0 to 99.

The DW register provides a Day of the Week status and uses

three bits (DW2 to DW0) to represent the seven days of the

week. The counter advances in the cycle,

1-2-3-4-5-6-7-1-2-…

The assignment of a numerical value to a specific day of the

week is arbitrary and may be decided by the system software

designer.

24-HOUR TIME

If the MIL bit of the HR register is “0”, the RTC uses a

24-hour format, and bit 5 of the HR register is the second

10-hour bit (20–23 hours). If the MIL bit is “1”, the RTC uses a

12-hour format and bit 5 of the HR register is the AM/PM bit,

with logic high being PM. The clock defaults to 24-hour format

time.

CENTURY INDICATOR

The century bit (bit 7 of the MO register) is toggled when the

years register overflows from 99 to 00 to indicate the change of

century.

LEAP YEARS

Leap years add the day February 29 and are defined as those

years that are divisible by 4. Years divisible by 100 are not leap

years, unless they are also divisible by 400. This means that the

year 2000 is a leap year, and the year 2100 is not. The ISL12057

does not correct for the leap year in the year 2100.

Addresses [0Eh to 0Fh]

The Control and Status Registers consist of the Status

Register, Interrupt, and Alarm Register.

FN6755 Rev 2.00

Sep 25, 2015

Page 9 of 18

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