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FM31T376-G Datasheet(PDF) 11 Page - Ramtron International Corporation

No. de pieza FM31T376-G
Descripción Electrónicos  System Supervisor & Temperature Compensated RTC(TCXO) with Embedded Crystal
Download  26 Pages
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Fabricante Electrónico  RAMTRON [Ramtron International Corporation]
Página de inicio  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM31T376-G Datasheet(HTML) 11 Page - Ramtron International Corporation

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FM31T372/374/376/378-G
Rev. 1.1
Apr. 2011
Page 11 of 26
Register Map
The TCXO 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 =
Data
Address
D7
D6
D5
D4
D3
D2
D1
D0
Function
Range
Serial Number Byte 7
Serial Number 7
FFh
Serial Number Byte 6
Serial Number 6
FFh
Serial Number Byte 5
Serial Number 5
FFh
Serial Number Byte 4
Serial Number 4
FFh
Serial Number Byte 3
Serial Number 3
FFh
Serial Number Byte 2
Serial Number 2
FFh
Serial Number Byte 1
Serial Number 1
FFh
Serial Number Byte 0
Serial Number 0
FFh
10h
Counter 2 MSB
Event Counter 2 MSB
FFh
0Fh
Counter 2 LSB
Event Counter 2 LSB
FFh
0Eh
Counter 1 MSB
Event Counter 1 MSB
FFh
0Dh
Counter 1 LSB
Event Counter 1 LSB
FFh
0Ch
RC
CC
C2P
C1P
Event Count Control
0Bh
SNL
FOEN
FC
WP1
WP0
VBC
VTP1
VTP0
Companion Control
0Ah
WDE
-
-
WDT4
W DT3
WDT2
WDT1
WDT0
Watchdog Control
09h
W TR
POR
LB
-
WR3
WR2
WR1
WR0
Watchdog Restart/Flags
08h
10 years
years
Years
00-99
07h
0
0
0
10 mo
months
Month
1-12
06h
0
0
10 date
date
Date
1-31
05h
0
0
0
0
0
day
Day
1-7
04h
0
0
10 hours
hours
Hours
0-23
03h
0
10 minutes
minutes
Minutes
0-59
02h
0
10 seconds
seconds
Seconds
0-59
01h
/OSCEN
CALS
CAL5
CAL4
CAL3
CAL2
CAL1
CAL0
OSC/CAL Control
00h
reserved
CF
reserved
reserved
reserved
CAL
W
R
RTC Control
18h
17h
11h
16h
15h
14h
13h
12h
Note: When the device is first powered up and programmed, all registers must be written because the
battery-backed register values cannot be guaranteed.
The table below shows the default values of the non-volatile
registers.
All other register values should be treated as unknown.
Default Register Values
Address
Hex Value
18h
0x00
17h
0x00
16h
0x00
15h
0x00
14h
0x00
13h
0x00
12h
0x00
11h
0x00
0Bh
0x40
0Ah
0x1F
01h
Factory
programmed


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