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M41T80 Datasheet(PDF) 14 Page - STMicroelectronics

No. de pieza M41T80
Descripción Electrónicos  Serial access Real Time Clock with alarm
PDF  25 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T80 Datasheet(HTML) 14 Page - STMicroelectronics

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Clock operation
M41T80
14/25
Table 3.
Clock register map(1)
1.
Keys:
ST = Stop Bit
0 = Must be set to '0'
32kE = 32kHz Enable Bit
CEB = Century Enable Bit
CB = Century Bit
OUT = Output level
AFE = Alarm Flag Enable Flag
RPT1-RPT5 = Alarm Repeat Mode Bits
AF = Alarm Flag (Read only)
SQWE = Square Wave Enable
RS0-RS3 = SQW Frequency
Addr
Function/range BCD
format
D7
D6
D5
D4
D3
D2
D1
D0
00h
0.1 seconds
0.01 seconds
10s/100s
of 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
0
0
0
0
0
0
0
Control
09h
32kE
0
0
0
0
0
0
0
32kHz
0Ah
AFE
SQWE
0
Al 10M
Alarm month
Al month
01-12
0Bh
RPT4
RPT5
AI 10 date
Alarm date
Al date
01-31
0Ch
RPT3
0
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
0
AF
0
0
000
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



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