M41T81M6F(2006) 查看數據表（PDF） - STMicroelectronics
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M41T81M6F Datasheet PDF : 30 Pages
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Clock operation
M41T81
Table 2. Clock register map(1)
Addr
D7
00h
01h
ST
02h
0
D6
D5
D4
0.1 seconds
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
FT
S
09h
0
BMB4 BMB3 BMB2
0Ah AFE SQWE ABE Al 10M
0Bh RPT4 RPT5
AI 10 date
0Ch RPT3 HT
AI 10 hour
0Dh RPT2
Alarm 10 minutes
0Eh RPT1
Alarm 10 seconds
0Fh WDF 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:
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
D3
D2
D1
D0
0.01 seconds
Seconds
Minutes
Hours (24 hour format)
0
Day of week
Date: day of month
Month
Year
Calibration
BMB1 BMB0 RB1 RB0
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
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
Watchdog
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
14/30
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