FM3104-S View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
FM3104-S Datasheet PDF : 22 Pages
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FM3104/16/64/256
Register Map
The RTC and processor companion functions are accessed via 25 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
Nonvolatile =
Battery-backed =
Address
18h
17h
16h
15h
14h
13h
12h
11h
10h
0Fh
0Eh
0Dh
0Ch
0Bh
0Ah
09h
08h
07h
06h
05h
04h
03h
02h
01h
00h
D7
SNL
WDE
WTR
0
0
0
0
0
0
/OSCEN
reserved
Data
D6
D5
D4
D3
Serial Number Byte 7
Serial Number Byte 6
Serial Number Byte 5
Serial Number Byte 4
Serial Number Byte 3
Serial Number Byte 2
Serial Number Byte 1
Serial Number Byte 0
Counter 2 MSB
Counter 2 LSB
Counter 1 MSB
Counter 1 LSB
RC
-
-
WP1
WP0
-
-
WDT4 WDT3
POR
LB
-
WR3
10 years
0
0
10 mo
0
10 date
0
0
0
0
0
10 hours
10 minutes
10 seconds
reserved CALS
CAL4
CAL3
CF reserved reserved reserved
D2
D1
CC
C2P
VBC
VTP1
WDT2 WDT1
WR2
WR1
years
months
date
day
hours
minutes
seconds
CAL2 CAL1
CAL
W
D0
C1P
VTP0
WDT0
WR0
CAL0
R
Function
Range
Serial Number 7
FFh
Serial Number 6
FFh
Serial Number 5
FFh
Serial Number 4
FFh
Serial Number 3
FFh
Serial Number 2
FFh
Serial Number 1
FFh
Serial Number 0
FFh
Event Counter 2 MSB FFh
Event Counter 2 LSB FFh
Event Counter 1 MSB FFh
Event Counter 1 LSB FFh
Event Count Control
Companion Control
Watchdog Control
Watchdog Restart/Flags
Years
00-99
Month
1-12
Date
1-31
Day
1-7
Hours
0-23
Minutes
0-59
Seconds
0-59
CAL/Control
RTC Control
Rev 0.2
May 2003
Page 9 of 22
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