FM3130 Integrated RTC/Alarm with 64Kb FRAM
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
0Eh
0Dh
0Ch
0Bh
0Ah
09h
08h
07h
06h
05h
D7
D6
F1
0
0
0
D5
F0
0
D4
WP1
10 mo
D3
WP0
D2
VBC
D1
FC
D0
TST
Function
Range
AL/SW
/Match
/Match
/Match
/Match
/Match
Alarm & WP Control
Alarm Month
Alarm Date
Alarm Hours
Alarm Minutes
Alarm Seconds
RTC Years
01-12
01-31
00-23
00-59
00-59
00-99
1-12
1-31
1-7
0-23
Alarm months
Alarm date
Alarm hours
Alarm minutes
Alarm seconds
years
10 date
Alarm 10 hours
Alarm 10 minutes
Alarm 10 seconds
10 years
0
0
0
0
0
0
0
0
0
10 mo
RTC Month
RTC Date
RTC Day
months
date
10 date
0
0
0
day
RTC Hours
04h
10 hours
hours
0
0
RTC Minutes
RTC Seconds
CAL/Control
0-59
03h
02h
01h
00h
10 minutes
10 seconds
CALS
minutes
seconds
0-59
E
/OSCEN
LB
-
AF
CAL4
POR
CAL3
AEN
CAL2
CAL
CAL1
W
CAL0
R
CF
RTC/Alarm Control
T
Note: When the device is first powered up, all registers should be treated as unknown and must be written.
Otherwise, unpredictable behavior may result.
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Rev. 3.2
Sept. 2011
Page 8 of 22
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
