m41t80 STMicroelectronics, m41t80 Datasheet - Page 14

• Manufacturer Part Number: m41t80
• Description: Serial Access Real Time Clock With Alarm
• Manufacturer: STMicroelectronics

Clock operation
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Table 3.
1. Keys:
Addr
0Ah
0Bh
0Ch
0Dh
0Eh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Fh
10h
11h
12h
13h
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
RPT4
RPT3
RPT2
RPT1
32kE
CEB
OUT
AFE
RS3
D7
ST
0
0
0
0
0
0
0
0
Clock register map
SQWE
RPT5
RS2
0.1 seconds
CB
D6
AF
0
0
0
0
0
0
0
0
0
Alarm 10 seconds
Alarm 10 minutes
10 years
10 seconds
10 minutes
RS1
D5
AI 10 hour
0
0
0
0
0
AI 10 date
0
0
0
0
10 hours
10 date
Al 10M
10M
RS0
D4
(1)
0
0
0
0
0
0
0
D3
0
0
0
0
0
0
0
0
Hours (24 hour format)
Date: day of month
Alarm seconds
Alarm minutes
0.01 seconds
Alarm month
D2
Alarm date
Alarm hour
0
0
0
0
0
0
0
Seconds
Minutes
Month
Year
Day of week
D1
0
0
0
0
0
0
0
D0
0
0
0
0
0
0
0
of seconds
Reserved
Reserved
Reserved
Function/range BCD
10s/100s
Seconds
Al month
Century/
Minutes
Control
Al hour
Al date
32kHz
Month
Al min
Al sec
hours
SQW
Date
Flags
Year
Day
format
0-1/00-23
00-99
00-59
00-59
01-31
01-12
00-99
01-12
01-31
00-23
00-59
00-59
M41T80
01-7