FM3130 Integrated RTC/Alarm with 64Kb FRAM

Rev. 1.0

Sept. 2006

Page 8 of 22

Register Map

The RTC, alarm, and other functions are accessed via 15 special function registers mapped to a separate 2-wire

device ID. The interface protocol is described below. The registers contain timekeeping data, control bits, or

information flags. A description of each register follows the summary table below.

Register Map Summary Table

Address

D7

D6

D5

D4

D3

D2

D1

D0

Function

Range

0Eh

AL/SW

F1

F0

WP1

WP0

VBC

FC

TST

Alarm & WP Control

0Dh

/Match

0

0

10 mo

Alarm months

Alarm Month

01-12

0Ch

/Match

0

10 date

Alarm date

Alarm Date

01-31

0Bh

/Match

0

Alarm 10 hours

Alarm hours

Alarm Hours

00-23

0Ah

/Match

Alarm 10 minutes

Alarm minutes

Alarm Minutes

00-59

09h

/Match

Alarm 10 seconds

Alarm seconds

Alarm Seconds

00-59

08h

10 years

years

RTC Years

00-99

07h

00

0

10 mo

months

RTC Month

1-12

06h

00

10 date

date

RTC Date

1-31

05h

00

00

0

day

RTC Day

1-7

04h

00

10 hours

hours

RTC Hours

0-23

03h

0

10 minutes

minutes

RTC Minutes

0-59

02h

0

10 seconds

seconds

RTC Seconds

0-59

01h

/OSCEN

-

CALS

CAL4

CAL3

CAL2

CAL1

CAL0

CAL/Control

00h

LB

AF

CF

POR

AEN

CAL

W

R

RTC/Alarm Control

Note: When the device is first powered up, all registers should be treated as unknown and must be written.

Otherwise, unpredictable behavior may result.