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M41T81 Datasheet(PDF) 14 Page - STMicroelectronics

Part # M41T81
Description  Serial access Real-Time Clock with alarm
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T81 Datasheet(HTML) 14 Page - STMicroelectronics

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Clock operation
M41T81
14/30
Table 2.
Clock register map(1)
Addr
Function/range BCD
format
D7
D6
D5
D4
D3
D2
D1
D0
00h
0.1 seconds
0.01 seconds
Seconds
00-99
01h
ST
10 seconds
Seconds
Seconds
00-59
02h
0
10 minutes
Minutes
Minutes
00-59
03h
CEB
CB
10 hours
Hours (24 hour format)
Century/
hours
0-1/00-23
04h
0
0
0
0
0
Day of week
Day
01-7
05h
0
0
10 date
Date: day of month
Date
01-31
06h
0
0
0
10M
Month
Month
01-12
07h
10 years
Year
Year
00-99
08h
OUT
FT
S
Calibration
Control
09h
0
BMB4
BMB3
BMB2
BMB1
BMB0
RB1
RB0
Watchdog
0Ah
AFE
SQWE
ABE
Al 10M
Alarm month
Al month
01-12
0Bh
RPT4
RPT5
AI 10 date
Alarm date
Al date
01-31
0Ch
RPT3
HT
AI 10 hour
Alarm hour
Al hour
00-23
0Dh
RPT2
Alarm 10 minutes
Alarm minutes
Al min
00-59
0Eh
RPT1
Alarm 10 seconds
Alarm seconds
Al sec
00-59
0Fh
WDF
AF
0
0
0
0
0
0
Flags
10h
0
0
0
0
0
0
0
0
Reserved
11h
0
0
0
0
0
0
0
0
Reserved
12h
0
0
0
0
0
0
0
0
Reserved
13h
RS3
RS2
RS1
RS0
0
0
0
0
SQW
1.
Keys:
S = Sign Bit
FT = Frequency Test Bit
ST = Stop Bit
0 = Must be set to '0'
BMB0-BMB4 = Watchdog Multiplier Bits
CEB = Century Enable Bit
CB = Century Bit
OUT = Output level
ABE = Alarm in Battery Back-up Mode Enable Bit
AFE = Alarm Flag Enable Flag
RB0-RB1 = Watchdog Resolution Bits
RPT1-RPT5 = Alarm Repeat Mode Bits
WDF = Watchdog Flag (Read only)
AF = Alarm Flag (Read only)
SQWE = Square Wave Enable
RS0-RS3 = SQW Frequency
HT = Halt Update Bit


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