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M41T81S View Datasheet(PDF) - STMicroelectronics

Part Name
Description
MFG CO.
M41T81S
ST-Microelectronics
STMicroelectronics ST-Microelectronics
'M41T81S' PDF : 29 Pages View PDF
M41T81S
Clock operation
Table 2. Clock register map
Addr
D7
00h
01h ST
D6
D5
D4
0.1 Seconds
10 Seconds
D3
D2
D1
D0
0.01 Seconds
Seconds
02h 0
03h CEB
10 Minutes
CB
10 Hours
Minutes
Hours (24 Hour Format)
04h 0
0
0
0
0
Day of Week
05h 0
0
10 Date
Date: Day of Month
06h 0
07h
0
0
10M
10 Years
Month
Year
08h OUT FT
S
Calibration
09h OFIE BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0
0Ah AFE SQWE ABE Al 10M
0Bh RPT4 RPT5 AI 10 Date
Alarm Month
Alarm Date
0Ch RPT3
0Dh RPT2
HT
AI 10 Hour
Alarm 10 Minutes
Alarm Hour
Alarm Minutes
0Eh RPT1
0Fh WDF
Alarm 10 Seconds
AF
0
BL
Alarm Seconds
0
OF
0
0
10h 0
0
0
0
0
0
0
0
11h 0
0
0
0
0
0
0
0
12h 0
0
0
0
0
0
0
0
13h RS3 RS2 RS1 RS0
0
0
0
0
Function/Range
BCD Format
Seconds 00-99
Seconds 00-59
Minutes 00-59
Century/ 0-1/00-
Day
01-7
Date 01-31
Month 01-12
Year
00-99
Calibratio
Watchdo
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
0 = Must be set to '0'
ABE = Alarm in Battery Back-up Mode Enable Bit
AF = Alarm Flag (Read only)
AFE = Alarm Flag Enable Flag
BL = Battery Low Bit
BMB0-BMB4 = Watchdog Multiplier Bits
CB = Century Bit
CEB = Century Enable Bit
FT = Frequency Test Bit
HT = Halt Update Bit
OF = Oscillator Fail Flag
OFIE = Oscillator Fail Interrupt Enable
OUT = Output level
RB0-RB1 = Watchdog Resolution Bits
RPT1-RPT5 = Alarm Repeat Mode Bits
RS0-RS3 = SQW Frequency
S = Sign Bit
SQWE = Square Wave Enable
ST = Stop Bit
WDF = Watchdog Flag (Read only)
15/31
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