M41T80M View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M41T80M Datasheet PDF : 27 Pages
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Clock operation
M41T80
Table 3. Clock register map(1)
Addr
D7 D6 D5 D4
00h
0.1 seconds
01h ST
02h 0
10 seconds
10 minutes
03h CEB CB
10 hours
04h 0
0
0
0
05h 0
0
10 date
06h 0
0
0
10M
07h
10 years
08h OUT 0
0
0
09h 32KE 0
0
0
0Ah AFE SQWE 0 Al 10M
0Bh RPT4 RPT5 AI 10 date
0Ch RPT3 0
AI 10 hour
0Dh RPT2 Alarm 10 minutes
0Eh RPT1 Alarm 10 seconds
0Fh 0
AF
0
0
10h 0
0
0
0
11h 0
0
0
0
12h 0
0
0
0
13h RS3 RS2 RS1 RS0
1. Keys:
ST = Stop bit
0 = Must be set to '0'
32KE = Enable bit for 32 KHz output
CEB = Enable for century bit
CB = Century bit
OUT = Data bit for OUT pin
AFE = Alarm flag enable bit
RPT1-RPT5 = Alarm repeat mode bits
AF = Alarm flag (read only)
SQWE = Square wave enable
RS0-RS3 = SQW frequency select
D3 D2 D1 D0
0.01 seconds
Seconds
Minutes
Hours (24-hour format)
0
Day of week
Date: day of month
Month
Year
0
0
0
0
0
0
0
0
Alarm month
Alarm date
Alarm hour
Alarm minutes
Alarm seconds
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Function/range BCD
format
10s/100s
of seconds
00-99
Seconds 00-59
Minutes 00-59
Century/
0-1/00-23
hours
Day
01-7
Date
01-31
Month
01-12
Year
00-99
Control
32 KHz
Al month 01-12
Al date
01-31
Al hour
00-23
Al min
00-59
Al sec
00-59
Flags
Reserved
Reserved
Reserved
SQW
14/27
Doc ID 9074 Rev 5
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