FM4005 데이터 시트보기 (PDF) - Ramtron International Corporation
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FM4005 Datasheet PDF : 23 Pages
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FM4005
Register Map
The RTC and processor companion functions are accessed via 25 special function registers. 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
18h
Serial Number Byte 7
Serial Number 7
FFh
17h
Serial Number Byte 6
Serial Number 6
FFh
16h
Serial Number Byte 5
Serial Number 5
FFh
15h
Serial Number Byte 4
Serial Number 4
FFh
14h
Serial Number Byte 3
Serial Number 3
FFh
13h
Serial Number Byte 2
Serial Number 2
FFh
12h
Serial Number Byte 1
Serial Number 1
FFh
11h
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
-
-
-
-
VBC
VTP1 VTP0 Companion Control
0Ah
WDE
-
-
WDT4 WDT3 WDT2 WDT1 WDT0 Watchdog Control
09h
WTR
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 reserved CALS
CAL4
CAL3
CAL2
CAL1
CAL0 CAL/Control
00h reserved CF reserved reserved reserved CAL
W
R RTC Control
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 0x00
0Ah 0x1F
01h 0x80
Rev. 2.3
Oct. 2006
Page 10 of 23
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